Then again, I suppose the parts they won't remember will have started after Fry's proposal, so if the show does come back, there should still be a change in the status quo -- I hope. Maybe someday we'll find out.
Nope. If it comes back Fry proposed with the button, the Professor said it would go back to before the button was made.
The writers don't like the two of them together, too limited. If it comes back than I doubt they will be engaged yet.