Toxicity is a choice of the players, not RIOT's/Dynamic que's fault. Toxic players existed in nearly all our games long before Dynamic Que ever existed. So if your complaint is about toxicity then report the players and make damn sure you are never toxic yourself (one less toxic player per game).
If your complaint is about Dynamic Que, what do you not like about it? (other than getting paired with toxic players, which again, happened long before Dynamic Que)
If your frequently getting paired with 2, 3 or 4 man groups the chances of your teammates communicating and playing more like a team increases, which increases your chances of better games (but certainly not guaranteeing). And if that's the case, Dynamic que increases your chances of winning. So again, what do you not like about it?
If your complaint isn't about toxicity or pre-mades, then is it about not testing/ranking individual skill? If so, realize Solo/Duo never did that in the first place. The game has always been about how well you can get thrown together with strangers and work together for a common goal. Your rank is based on Win/Loss, which is a team effort. So you've always been ranked on how good you are at adapting to whatever team your given. So again, what do you not like about it?