Re: Ranked solo-queue only mode
I don't think having a testing phase for this is too bad, though I personally do feel like this solution won't really help that much.
Matchmaking should probably be addressed first to fix the rank disparity with solo-queue + duo players, better take care of the core problem first.
As for the communication, yeah that can be a real pain in the *, though it's not guaranteed that other solo-players will show better behaviour, they might just say nothing and scream until the end.
As for the rest, well, we'll see how that goes.
Though do note that by splitting up queues that it will increase queue times for both parties, one of which did probably not ask to have increased queue times.
By splitting up queue times it will also create another issue where it'll become harder to find players of the same rank on your team, as the players are more split up.
(This issue will also become more apparent on lower populated regions and ranks)
Of course we can still try it, we're just touching a theoretical basis right now, though I do think the negative side will bring some issues that might make it not worth it.