No one knows, but if I had to bet on Avatar vs GotG purely on IP recognition in 10 years time I'd take GotG hands down.
Comic book movies have been steadily and consistently growing in market share for 27 years (counting from 1989's Batman rather than 1978's Superman - because that one didn't really launch comic book movies as an independent genre). People have been saying the genre has been played out and on the verge of collapse since the beginning. Comic book movies have made it past the fad phase and into a proper nostalgia cycle. (What happens when James Bond, Star Trek, The Muppets, Star Wars, Jurassic Park, or Harry Potter dies out?)
I DO! And I loved every moment of it's existence! It kept Tron in the public eye and gave me hope that further expansions of the franchise were still being considered. (Fast forward to 2016 and Shanghai has a Tron coaster and lots of merchandise that people are buying at a good rate. It's keeping alive one of my childhood favorites and building my hopes again.)