I had an inkling that they were kidding round and thought I'd have a look to see if it were mentioned and it wasn't, so that's why the question was asked.
It's probably not true dude. I'm sure "It's just a joke" (In Rowan Atkinson from Rat Race voice). If it ends it'll be more abrupt and likely not a planned event. I've been listening to the show since the episode 18 with Al Lowe and this ending at 250 has only been a recent thing. Besides, think of all the money they'll lose on the Player One Podcast iPhone and Android app.