Islands are likely to become 1-3 players flex in 9.0. I really hope they make more single player friendly content that is also possible to do in group.
I think it would make everyone happy and take care of queue issues. If someone really wants to play in a group, they can, if they don't feel like it, they should be able to solo the same content using some kind of a flex scaling mode. Hopefully a system with some kind of a solo end game progression.