Dynamic Que isn't the problem, but Solo Que isn't answer either.
In Season 5, I saw people complain about how Solo Que was too random to Climb with. They said it was completely random and too biased upon the chances of getting an AFK, Troll, or "Bad Duo" or the enemy team having one of those. They said that it wasn't a matter of how skilled you were, but how lucky you were at not getting an AFK, Troll, Bad Duo, etc.
Insert Dynamic Que, Riot's solution to this problem. By teaming with, possibly, an entire team of teammates, people you know and trust, this should truly help show that this is a team game, and if you lost, you had nothing but your own skill to blame. The Problem though? It didn't get rid of AFK's, Trolls, or Bad Duos (Or in this case that single player). Premades of 2-4 will always have that chance of getting that one toxic/horrible player.
So, we're back at where we started, where the game's ranked ladder seems to random to climb due to the chances of getting a Bad Premade, AFK's, Trolls, etc. The main problem isn't Dynamic Que, its still the Trolls, AFK's etc. That has been the one constant variable between the two Ranked modes. Getting back Solo Que isn't going to solve this problem, nor is Dynamic Que going to solve it either.
Honestly, I don't know the true point of this post. It doesn't seem to have a straight up answer for it either. I just want to point out, that no matter what system we put in Trolls, Afk's and the general scum of gamer kind are also going to exist in it.