My Dynamic Queue Theory
I could be wrong, but here is how I think that Dynamic Queue is going to affect the game later on:
When you climb in solo queue, it was because your individual skill as a player was moving. However, in dynamic queue, it is no longer about your individual skill, but rather your premade. For example, in solo que if you moved from Gold 5 to Gold 1, it was because your skill has improved and you're now playing at a Gold 1 level. Rather in Dynamic Queue, you may have climbed from Gold 5 to Gold 1, but that does not mean your individual skill as a player has improved, as your premade would have assisted you in your climb.
Therefore, there would be players in Gold 1 (for example), not playing at a Gold 1 level, maybe 2, 3 or even 5, but have only climbed because of the skill of their team. So when these people finally queue by themselves, it will negatively affect the team that they are on, as they can not match the skill of those they are playing with.
Could be 100% wrong, but that's just my theory.