There's always XDA-Developers.
I know this doesn't excuse HTC, but, there is always the considerably active XDA-Developers community. Gingerbread is available. Warranty is probably over now for most owner (barring new ones of course) and it is relatively simple to root. There is now no reason not to root. Warranty (on newer devices) withstading.
Xda-Developers being the divine being.
However HTC could issue a software update which roots and S-Off's the phone, but this will no doubt invoke a negative reaction from the press. - handing over to the developers community, abandoning the device. Although giving control to the community abandonment is better than straight off abandonment.