There will be no sequel, remake or anything like this. The show will be over tomorrow and life will move on. I don't expect that HBO, D&D or GRRM will be ruined after this in any way.
People will be really interested in GRRM's version of the story andif he ever finishes the books it can be Harry Potter level of popularity, HBO will continue to produce successful TV shows and D&D will have long and successful careers because even if everyone think the last season is the worst thing ever done(and that won't be the case), the fact that they oversaw the biggest TV production in history for such a long time will always remain. Even Stephen King (who loves this season) had controversial endings of his stories, but he wasn't ruined after that. Life goes on.
I'm sure that D&D wanted S6 type of reaction to this season. They won't get that, but I still thing experience they had while working on GoT will be positive. Actors, directors, everyone else. They made a lot of money, made a lot of friends and even found lovers. And I also think no matter how stressful this was in the last 12 years they had a lot of fan working on this show.