Hah! As much as I'd like to see that happen too, I doubt they'd even do that as an April Fool's joke. The industry is pretty convoluted when it comes to that.
But yes, interesting food for thought, for sure. :P
Maybe it's just me but Mark Hamil, didn't really seem all that interested in playing Luke again in this movie, like he was just reading his lines and nothing more.
I still Like Rogue One best from the recent movies.