Jester David
Hero
Well, if the only time you play & run is AL, I can see that being an issue.I have been holding off on buying WGE and GMR until we know if anything in them will be AL legal.
It doesn't sound like the settings will be used anytime soon: http://dndadventurersleague.org/when-worlds-collide/
I imagine the options in Ravnica will be legal, and it seems likely that the races and artificer from Wayfarer's Guidewill be legal as well after some more testing.