Fact Check: Around 11% of the global player base is really pissed at Riot over DQ
Cactopus, a Rioter who writes reveals, patch notes, etc (ie, a professional memer), said this on reddit. (Source). Also including the full text, and a screenshot just in case he edits it later.
This game has steadily grown for seven years, so I feel unqualified to say "never," but the most honest answer I can give you is that no, it's not coming back.
It would be one thing if the feedback that we got from most players was that they don't like Dynamic Queue, but that's not what we're seeing. It's a segment of about 11% of the global player base that's really pissed at us because of the switch. It would also be another thing if people were quitting League because of dynamic queue, but our monthly active user numbers are as high as they've ever been (I really wish I could tell you the actual number—we're keeping it confidential for now but some Rioters are pushing for us to share it soon).
The problem is that when we made this switch, we didn't do enough to take care of the segment of players who really wanted a pure solo queue. We needed to launch new communication features to help solos against premades, and it took us a while before we realized how important it was. We're moving past the "we all want solo Q" argument that some players are still making, because we know that most people are actually fine with it. Instead, we're dedicating serious resources to competitive play to give solo players the tools they need to play seriously. You can guess what some of those tools are.
You're not alone, and Riot hasn't done right by you this season. I hope you hang in there with us while we prepare to deliver some changes to the game that'll make things better.
Sorry for the boring-ass tone of this post. I'd keep it more light but this is actually a serious issue and it matters to me personally.
2016-07-06 Edit: This post is a fact check, nothing more. I posted a source, and none of my own opinions (although it does have Cactopus' opinion in the quote). If you think I have an opinion one way or another based on the content of this post, it speaks more to how you are interpreting these statistics than to what I actually think.
I'll explain my thoughts in a comment, so the main post stays unbiased.