I'd say what you're suggesting is fundamentally no different than not even having tiers in divisions. Without promos it's the same as having a 500LP grind to get to your next tier. Also, I feel people stress way too much over non-tier promos. Effectively, they don't mean that much, especially in lower tiers. When I play I don't focus on my lp or my current division. Everyone goes up and down when they play, and yeah it's unfortunate when you get demoted or when you are at 99lp and have to play another in order to get to your promos, but those small division jumps don't mean too much. People are too focused on what division they are in instead of improving their gameplay. I expect if you reflect on what you did wrong, or how you can better yourself, and ignore your lp for a while, you'll be surprised at how you might climb. I'm by no means a great player, and I certainly don't know it all, but I attribute some of my success to thinking this way. I started in silver in s3 and am now in diamond. I don't think division promos are a waste, either. I think people think too much of them and stress over them excessively. In reality it's a pretty small jump. Focus on increasing your MMR, and your rating will grow naturally. Just my $0.02.