User blog comment:Bowl108/Signs Point to Phineas and Ferb's next season to be their last/@comment-3251190-20120521151539

I don't think it will end just yet. There's still a movie, a two-part episode in July.

Also, like Knarrow said below, "Gravity Falls" won't cause the show to end. "Fish Hooks" is airing on the same channel, and nothing bad is happening to P&F (That, and the fact that Fish Hooks kinda sucks imo). Not saying that GF will be bad, but it doesn't seem like it will be better than P&F