The Autofill Paradox
The Autofill Paradox: Autofill is enabled when too few players are in queue. When autofill is enabled, nobody is willing to get in queue.
Thus, the cycle never ends.
On a serious note, I'm willing to wait 2 hours for a game, but I'm not willing to play my offrole in ranked when I know everyone else isn't. Dynamic queue was annoying at first but with autofill thrown in it is just unbearable.