No run time is written in stone. There was no reason to cut the movie down to a 2 1/4 hour run time aside from trying to fit as many showings of the movie into a day as possible. That's not an artistic decision; that's financial. Endgame had no problem making money being as long as it was. So why hamstring JJ and the finale of the Skywalker story with a run time which made him apparently delete a lot of very good and usable stuff? They're not doing this out of the goodness of their hearts. They're not doing it because of a social media campaign. If JJ didn't have the clout to get the three hour version in theater's in December, I doubt he has the clout now to get this done in January. So...why? It's money. I don't buy it's artistic in any way. For the record, I doubt this will happen. If it does, it is Disney and LucasFilm admitting their original product was a rough cut or incomplete, similar to Cats sending a new version out with extra CGI after release. And that's not something Disney ever fesses up to.