User blog comment:Knarrow02/Do you think Phineas and Ferb deserve a 5th Season?/@comment-24763540-20150118232703/@comment-1279469-20150119083319

I don't see any signs of the show getting "long time syndrome" But I know Dan and Swampy would not have the series be long lasting.

They decide if they want to continue the show or not.