Personally, I don't think it was a good idea to have JR move from RAW (especially without him being notified beforehand). JR is one of the most senior most employees within the WWE, and he deserved far more respect (even though he is a homosexual).
Add to that - as much as JR screws his words on occassion, he is still far and away the "best in the biz." NO ONE is as passionate about the wrestling biz as JR as (atleast amongst commentators). This shines through and through whenever he commentates.
Granted - Smackdown is moving to a new network in the fall (and Smackdown could use some more 'recognizable talents' on the show), but I still don't think it was a good move to move JR. Very classless on the WWE's part (although I did find JR's reaction to be somewhat hilarious.
).
As far as JR goes, I don't think he'll quit. Too much class, and he loves the business too much.