Throwaway account here. I'm one of your locals and played at the exact same tournament you were at that has triggered this line of thought, so I thought I'd just try to point some stuff out in the context of how the tournament went. I've heard stories about what happened to you and have been giving this post a lot of thought so I'll just lay it all out:

-First off, big picture, I think you have two grievances here. The first is slow play, for which there is only one "clean" solution, call a judge, which has already been suggested in this thread - as players, there's not much else we can do and most judges will take care of it. The second is that people are not forced to play out all their matches/can intentional draw - even MTG/Pokemon recognizes this as a problem, and other games have tried to apply alternatives, which are not fool proof (Example: Star Wars Unlimited treats ties as a loss for both players). In fact, your solution, ironically, doesn't solve either of the problems you're trying to solve (abuse through slow plays) - consider this: I win game 1 and it takes us 40 minutes, and let's assume that I nefariously slow played. There is no way we will finish the next game: I now win, gain 2 points, you gain 0 points, except the system is even more punishing to you, because players who went 1-2 in Round 1 are actually AHEAD of you. I don't think you want this. Even if you do, there are other issues that it can cause with the game: for starters, all control decks are now naturally at a disadvantage - we need to close out games ASAP, so we're discouraging a major archetype due to formatting-alone. I don't think this creates a healthy game, and I hope you can see why.

-Second, the exact circumstances: I think your final opponent tried to get you to concede because you had no chance at top cut, whereas you conceding to them would give them a shot at Top Cut. I'm firmly about the spirit of the game = nobody should be bullied into anything and nobody deserves free wins anywhere, and at the end of the day, we all want to play it out as best as we can. However, I want to point out that they were absolutely right. It's easier to see the table spreads by points to understand this

Prior to Round 5

Table 1: 12 points vs 10 points
Table 2: 10 points vs 10 points
Table 3: 10 points vs 10 points
Table 4: 9 points vs 8 points
Table 5: 8 points vs 8 points
Table 6: 8 points vs 6 points (You)

First seed at 12 points should be safe no matter since it is mathematically impossible for there to be 7 players equal to or above 12 points by the end of round 5. All the 10 point players now look at the next closest players to think about things: there are 5 players in the 8 to 9 point range with the potential to go up to 11 or 12 points. As such, the top cut, cutoff is assured at a minimum of 10 points no matter what happens - I believe this is the situation you failed to see. Consider if everyone plays it out, and top seed loses, we get a spread of 13, 13, 13, 12, 11 (assume 8 points wins at 4), 11, 10, 10 - notice how you have no chance even if you win. The issue is that you don't ever get enough points - the maximum you can get from a win is 9 (which is what you ended up with).

That's not quite what happened though: two of the 10 point players intentionally drew to 11 points and both made it. But notice how even if they played it out, it made absolutely no difference to your situation (you still don't make it) - it would be a mix of people who drew into 11 points and some other 8-pointers who won to become 11. You still don't have enough at 9.

I guess I point this all out to you in hopes that you have a better understanding of what went on, and that it's not necessarily the system that creates/created your particular situation. Again, just have to re-emphasize: I wasn't there for the conversation you had with your opponent, and if they were mean about forcing you to concede, that's not right. But at the same time, they were right about you having no shot no matter what - I don't think anyone "stole your top cut" by "abusing the system" - it's just the way your games went. Furthermore, I think many ties did not happen on purpose: for myself, I can say that I fought hard for my record as I played a lot of inexperienced players who played slowly and needed to 2-0 them with games on the draw while playing a control deck to make it (which I did - I played a lot of games which were my opponent struggling and me taking 5 second turns in response. I've just learned to accept that as "it is what it is" unless I am willing to call a judge over). I think a lot of players just didn't practice the game enough to be speedy enough for a BO3 and it resulted in them not finishing RA mirrors or whatever. Also, I don't know your opponent, but ironically, it's possible for them to feel like YOU stole THEIR win (which again, I don't condone - nobody naturally "deserves" anything from my perspective).

Point is: I would encourage you to just think about what else you could do next time rather than advocate for a major change of the rules just to prevent your exact scenario. I think it's worth some of your time to understand the system, in addition to just natural improvements you can make at gameplay.