It takes a lot more than a few to provide support. It would take years to get near the support that Red Hat provide now.
Theoretically, it seems all Red Hatters could quit simultaneously and form a new company according to the same structure they had before.
Of course in practice that requires a lot of coordination, there's a ton of legal hoops to jump through and you end up with a big company built around customers it doesn't currently have.
Buying an open source company only makes sense if you give the employees of that company exactly what they want. They are the real value.