Now that's a curious idea. I like it. Plus that leaves door open for Liam Neeson to return for a cameo or more.
Well, as the saying goes, it's the sudden stop at the end of the fall that kills you. And Mace Windu had a long way to fall.
It only takes about 12 seconds to reach terminal velocity. Considering the height and that Coruscant is 100% metal and concrete I think that would do ALL the damage.
Why does everyone assume Palpatine used just enough power to shove him out the window into a debatable landing? It was Unlimited at close range against a highly trained and experienced opponent, who could go on to cause a great deal of trouble for the Empire, not Luke Skywalker.
I could maybe see Windu surviving a face full of Force lighting, or the fall, but surviving both seems pretty unlikely to me. I'm pretty much going assume he's dead, at least until we actually see him alive after RoTS.
To be fair, though, I doubt that a tie-in would be allowed to confirm or deny his death given the remote possibility of Samuel L. Jackson being asked to return in something set twenty years later. Maybe he survives but is not himself and certainly not a Jedi; maybe he definitively dies before ROTJ. He could return as an older Force spirit and we find out he died later than ROTS, connecting the dots backwards. Either way this should be a character piece far beyond the supporting role from the films and TCW.
Yoda did tell Windu about force ghosts before he did tell Obi-Wan. I don't think he had enough time to learn that. Certainly more than Anakin, though, who appears to have taught himself in his last moments after force Obi-Wan had probably pestered him.
Maybe Qui-Gon had been somehow communicating with him, helping some good in him survive all those years.
Some of my favorite fan art is Force ghosts coming to support Anakin as he returns to the light. I love the metaphysical idea of them trying to reach Anakin even in death.