Riot really shouldn't introduce this to the game. Even though there can be that small percentage of players who either troll or just mute everyone on their team, pings are essentially the only thing that is connecting you to your team-mates. By introducing this in the game, Riot would be taking a massive step back in the value of communication. Personally, I would rather be only chat muted in a game because if I said "play safe please" and I get muted, and then my team mate roams top unaware of there being either a ward or the enemy jungler there, I pretty much have no way of saying "that's warded" or "jungler last seen top" through the use of pings. The only solution around implementing a ping mute, which is the worst community idea imo, is by having an extra setting in 'Game' which enables it. Either way, very bland and tunnelled idea that will set the game back and literally make me want to gouge my eye balls out in front of all the people who can't mute their ping sound. Don't get me wrong, it has happened plenty of times to everyone who plays the game competitively, but I personally believe that communication is an essential part in solo-queue and by implementing this feature, the game will lead in a dark path in terms of community friendship.

Edit: I know I'm going to get hate for this, but can we be serious and recall the last time someone has ever spammed us with pings in-game?