Persuade all the key Enterprise / Commercial / Business SW sellers to port to OS X *AND* Linux. Not just Red Hat either.
That's a better solution than funding React OS, because MS will need to listen to Business and essentially have Win98/Win2K/XP/Win7 GUI and concentrate on coherent control centre, admin tools, functionality, bug fixes etc instead of Fashion, Cloud, Tablets & Phones.
We don't need anything "new" in Windows, we just need it to work. Fix the things people have complained about for 15 years. Don't copy Android, ChromeOS, or even OSX.