I think Jon Snow is dead but I also think he won't be for long. There is a reason she was riding to the wall and it's not because she randomly decided to abandon Stannis
Indeed. Jon isn't dead he's been parked. Stannis daughter sacrifice was for Jon, and the Red Witch will learn of this next season IMO. She's there for a reason its no coincidence.
With Jon out of the picture it allows the WW to reign hell on the Wall and topple the NW but Jon will not be there to stop them or get killed by them. I remember now something Sam says, and its of great significance. "I've always known Jon to come back, he always comes back". He'll be back, Kit and the makers are being coy, in a sense they're not outright saying Kit will never return to GoT, which probably means yes, Jon is dead, but Kit will return as something else with the Red Witch. I expect him to really tear shit up. The WW generals are already weary of him, hes too big of a character.
Stannis being dead also means the WW are free to pulverise the Bolton's too. More I think about it, season 6 is sounding much better.
Ned, Rob were decapitated, theres no coming back, that's not the case with Jon. Especially when we've seen people returning in this universe, the mountain being the most recent.