Any of these idiots claiming to be professional editors are completely full of crap when they say that so many people moved away from Final Cut. We're talking about an industry here where the companies who started on Avid stuck with Avid, and in many cases stuck with the same version of Avid, for YEARS past when "everyone" else switched to Final Cut. Hell, most Avid editors I've talked to openly admit that Final Cut is a better product. They simply keep what they have because that's what they're comfortable with using.
That's the impression that I get out of everyone I've met in the industry. And certainly it's what I've experienced. Although I did use Premiere in college. And of course I hated that POS so I switched to FCP as soon as it was available. Then everyone was saying that Premiere got a little better, but I never took a second look and neither did most others.
And you're right, most people don't care unless there's an established workflow to deal with. If your software fits in, no one gives a crap. At least that has been my experience in most places. And for the record, almost everything I deliver is in Quicktime, but I'm mainly a freelance motion graphics guy (though I'm still a good editor).
A lot of places are practically tapeless these days using DG and the like. Unfortunately, everyone wants something different. A cool service would be something that you can put an uncompressed video up and it converts on the fly so that people can download it in whatever format they want. One day that'll happen. Not with today's tech though.