That's an excellent point, Harry. Though I would quibble (that's not to say 'argue,' you know

) on a very small portion of it: I don't know that it would be that much of a support hassle for them.
They really ought to release a de-bricker of some sort if they went that route. I'd expect one such to cover most situations -- in fact, the Hard Reset would probably already fill that bill.
Beyond that, they could just tell people who managed to
really hose their units, "We don't support 3rd part stuff, but we'll be happy to clean up your 3rd party app generated mess ... for a fee." They already seem to have that part down pat.
I know the devices are
very different, and I'm not trying to draw a
general analogy, but this approach seems to have worked well enough for Palm.