Once the platform takes root, creative people have to leave. It's always that way. The corporate energy flows in and organizes things. You need lots of good people to support developers, develop related technology, port the software, manage huge developers' conferences, and keep it all working. Once the system is in place, the focus shifts.
Creative people spin off from the mother ship.
That's how the platform gets some of its best-timed and positioned application products. That's how niches get served. It's the yin and yang of the process. The platform happens, and new companies form. The platform vendor digs in.