Given the utterly deranged and wrong things Jarpiss thinks about Supernatural and Dean, along with Jackles general contempt for the asshole, I am starting to think an actual SPN reboot would be impossible.
Jackles could attempt to close off Dean and Cas's stories in a proper way within The Winchesters if he gets more seasons of that, or perhaps bring out another spin off focused on Dean and Cas after having escaped to another universe perhaps?
But a full on SPN reboot with Jarpiss once again taking on the role of Sam? Honestly I think its unlikely.
The only other way to do it is either recast Sam, or wait another decade or so and then reboot SPN again from scratch but with a whole new cast of twentysomethings.
I doubt they'd recast Sam, as even with Jackles contempt and Jarpiss's general appalling behaviour, it would fire up so much bad press and piss of the deluded bronly/j*red stans so much they'd prob get violent (theyve been known to in the past).
So what does everyone think the options are here? A proper send off in The Winchesters? A new spin off focused on Dean and Cas? (Which could also generate controvery in itself), or a full reboot with all new cast and Jackles taking on a producer role and maybe some time travel hijynx for him and Misha to cameo as older Dean and Cas (like they did in the Star Trek reboot movies).
Personally I'd like a mix of all these options! So long as we get proper closure for Dean and Cas's stories, which I genuinely believe at this point is Jackles ultimate goal in whatever he is planning.