A sequel to the Reboot is basically a return to the Original Trilogy storyline.
Or, seeing how the movie is not that close to the original game to begin with, the movieverse continuation could be a brand new adventure set in that timeline, it really doesn't need to be a retelling of GC or UYA.
What Kubak said. And even if they would re-imagine GC. Who would be the villain in it? I don't think it is going to be Qwark, like in the original GC, who is in prison and as I understanded friends with Ratchet and Clank in this new timeline.
I am also thinking the people who the R&C PS4 is their first R&C game they have played. I think they want to see a sequel for this game more than the original series, just because they have not played those games.