I can say that it will reduce players playing premades as the impression I have is that all SoloQ advocates want the exact same rewards/incentives as the 2s/3s ladders; if this is the case, then why bother ‘going to the trouble’ of forming a group when you can just solo it up?
I’ve seen what soloQ does ‘on other WoW servers’ and it ain’t pretty, just saying.