I don't mind either of them as I adjust to whatever the game hands me, but I can't realistically see a second queue for solo-only coexist with up-to-4-queue. Not because it would be a bad idea, but because it would divide the playerpool of frontlines greatly, to detriment of both. I am uncertain if we have a playerbase large enough to facilitate both.
Now if it was 8v8v8, that'd be a different story.
