I'm not so concerned with the Mac Pro being dropped, just the overall business objectives/strategy Apple has for its future Pro applications. I'll be honest, I was using FCP X the other night, and it's paradigms are ground breaking, but it's still so very much a Beta program, that it can't be integrated into any sustainable business structure/model. It is sooo sluggish and buggy.
We have to remember, Apple doesn't live and die by its Pro application revenue stream, which is good and bad. Good, because it can treat it as a hobby for innovation in our field...but the implications of that are that we as users are held at the whim of a company that could care less about our 10 years or so of archived FCP projects, or that we have built businesses and intellectual property around its software. At least give us a way to import old projects to show us you care.
Avid on the other hand lives and dies by sales of its software. That's a good thing and bad thing. Good because they will listen to their customers, bad because they will fear innovation...I mean just look at the program, it feels so archaic and clunky, even the new 6.0 release. Avid is less concerned about innovation, and more concerned about keeping things stable...keep that stable income stream coming in, don't tick anyone off or there goes our bread and butter!
So for me, I'll use both pieces of software. I'm not going to commit to any one tool to tell my stories. Depending on my project's needs, I will use either Avid, FCPX, FCP, or Adobe Premiere... -- I'm sure a year from now one will stick.