The uproar about FCP X is mainly caused by the disconnect between Apple’s view of FCP and that of many of its professional users… I’ve created a very simple (and imprecise) graph to try and represent that. The numbers are made up but are intended to illustrate the broad point about the difference in perspectives about what the product is.
The main issue is that for editors in the Film and TV world FCP is basically one of two options. For Apple however the Film and TV post market represents only a small fraction of the current FCP market, and a absolutely tiny fraction of the potential market for a new application.
For the editors FCP is a big thing, for Apple the TV/Film world is a small fry.
Edited: By request of FCP editor Doug Dillaman, my representation of the FCP X potential market.