I must disagree with this... on pretty much all points.
you cannot force others to accept something that they do not wish to.
Actually, you can. If I lock in Poppy support, I force my team to cope with it. They can choose to flame me or throw the game, but that makes them griefers, and me the victim in all of that, meaning that they ends up in the tribunal (eventually if they keep at it), and I don't (unless I flame back).
League needs a meta, and while the meta must be changeable to survive, league cannot survive without it.
I think this is a grave misconception of what the meta truly is. Even they ended up buffing the xp share ratio of all creeps and jungle monsters to 100% it wouldn't really change the meta immediantely, since the meta isn't something that is created, it's something that slowly appears. The meta is basically what you expect to see when entering a game. saying that Summoners Rift is 5v5 is as much part of the meta than going 1-1-1-2, and letting onyl 1 of the 2 takes creeps bot. Whatever you assume will happen in the next game is the meta.
So basically, even the first day LoL was released there was a meta (Play champions you enjoy, kill your opponents as much as possible, group up for taking down major objectives likes dragon baron and inhibitors/nexus, etc.). Even the first time that a new game mode is played, there's a meta that's based on everyone's experience of other game modes and whatever info is available about that mode. You cannot have no meta, and the meta cannot be static unless the game is terrible (because as knowledge grows, the meta evolves).
The majority of league players( in my experience) blindly follow the pros, without thought or reason.
The majority of the players actually don't even watch pros, and thus have no real reason to follow them. What happens is twofold. First, everyone plays whatever they enjoy and feels help them win, and that automatically escalates toward stronger picks and more efficient strategies. Next, a minority also watches LCS/streams and use whatever knowledge they gain from it to get an advantage over their enemy. If Imaqtpie says that the new Lucian is way broken, and that I can see him getting stomped by Lucian 5 games in a row without much place to gain some ground back in 3 of the 5, I will assume that he's right since he's more knowledgeable about the game than me, and showed me arguments that Lucian is indeed very strong.
Then, all players end up "communicating" (read as shout at each others' face) about their finds and tips and tricks (the most prominent example is ban phase), and proceeds to work "together" toward victory. All those exchanges often ends up siding with what pro does since they often follow safe and consistent strategies.