What animated series that ended is inevitably going to come back?

I can’t be the one one that has noticed that no truly beloved animated series stays dead anymore, be it continuations, reboots, or remakes: when it comes to animation, an ended series tends to return in some firm or another. I mean it’s not hard to imagine that should the day come that the likes of The Simpsons ever ends, that it won’t be gone for long.

So what has been gone for some time now, that you suspect is inevitably around the corner to return in some form?

For example, now that Close Enough is over, I can see Regular Show returning at some point. I also feel like Space Ghost Coast to Coast is overdue for a return.