And he may not be back next season. But after? I think some of his comments are open to serious parsing.
If Jon is truly & forever dead and not resurrected in any form, I figure the whole point of his story was how close someone got to making a dent in this White Walker looming threat. And yet mostly failed, perhaps due to too much honour (not going all dictator and killing Ser Alliser and others earlier). Meaning only Danaerys alone can fix this now.