First, their telling people to consider the Droid X probably has nothing to do with any issues except for the unavailability of screens, and the 4-6 week back order. If they get a faction of people to switch, it's that much closer to getting them in stock. And the apparent OTA, that provides 720p video amongst other things, should be clear that they ARE supporting the phone. As you can imagine, HTC has probably focused alot more on production and sourcing problems thus far.
And neither HTC nor Verizon are responsible for what Seidio makes, or doesn't. Do you have a source for that (I'm not doubting you, I just couldn't find anything on Google)?
Hopefully they will get the signal patch out quick, and SHOW that they're supporting the phone.