I see where you are coming from but at the same time weirder things have happened. I could see a lowkey extension (maybe a year so he's here until 2021) and then a move away on a loan to start.There is no way he'll stay with us past the summer. 0 chance, imv. Take a pay-cut and reset his career - any sane player at his age would do that
But yeah, after Sissoko and Rose won Poch over I don't rule anything out. Janssen was apparently in a bad place when he and Poch had their falling out so who knows.