Guns n' Roses just released a 30 second promo video that seems to tease more tour dates for 2017. If you'll recall, this entire reunion and Not In This Lifetime Tour came about by video teases, photos tweets and a sign on a marquee.
It wouldn't surprise me if GnR swing back through America again next year. The money is good and there is still demand. I doubt I'll go again since I already spent enough cash seeing them this year, but I know I'm in the minority. Plenty of people paid to see them three, four and five times!