It's a free forum, I can comment on whatever I like, as can you, as can everyone.
I think you are taking this way to serious. Its a game meant to bring enjoyment, this is as much true for casual scum like myself as in the competitive scene. The only place where enjoyment isn't a true factor is in the LCS.
People that start talking about how useless or bad their team mates are are a cancer in the community. And yes I get it, I've been there myself I know how it feels, I got a friend who is just absurdly bad at this game and whenever I play with him the game itself becomes that much harder. I know how it feels. But they aren't the problem.
You also need to realize that this isn't csgo, what works there may not be possible in LoL. It's not like you're the first person to ever complain or give suggestions on how to improve ranked and yours are as bad as those of everyone else.
Or perhaps you don't take this serious enough. Do you understand the system Riot uses and why they use it? Do you understand the ramifications your suggestion will have on it? All I see you do is throw out some idea in your opening post but you never elaborate on it, what is it supposed to do, how does it do it, what are potential problems and solutions, etc, etc.
You know what the funny thing is, your half baked idea might even be possible to do, with the mastery system we have now it might actually be possible to get a rating for individuals and excuse the good players from dropping as fast as the bad ones, and its one that can't be exploited because nobody truly knows how it works. Funny how you can't seem to mention this. For all you know Riot has been working on it behind the scenes for a long time.
But is it fair? Can you answer me that?