Letting us scale the UI should be standard in pretty much every game, especially RPGs...
And I never understand why more open world or exploration games don't allow a sort of 'Immersive Mode' for the UI. Playing a game like GTA V or Dragon Age INQ looks so much better with the UI completely hidden. Or, for a lot of PC RPGs or at least MMOs on console like FF XIV, let us shrink or grow the size of the UI as we want.
I play FF XIV with a UI even tinier that that on my TV. Just having standard UI scaling should be a pretty obvious solution for everyone though.