If this turns into a "real issue", such that XCode 3 was rescinded and XCode 4 remained paid only - as opposed to some stupid accounting problem which might mean it would be bundled free with Lion, with XC3 hanging around for (Snow) Leopard - then I suspect we'll soon see MacPorts or their kin come up with a downloadable toolchain based on this existing Apple open source work that would allow them to continue virtually unchanged.
It would be "neat" as in clean. No drama on Apple's behalf. Just put a price tag on the only real compiler, and it's over. Unless someone solves that issue.
I love my mac, I have since OS X was mature enough to be useful, and I've converted tons of people, and I have lots of credit cards.. it's not about the money - Apple is seriously making me think about ditching them.
Isn't this like saying that you'd really like the new version of the dev environment on CD because you don't like DVDs? I doubt anyone would be complaining if it was 2003 and Apple was charging a $5 shipping and handling charge to ship you a DVD.