I would like to think both the DX and D2 will get the same if not better support from Moto than the original D1...meaning, almost 3 years after its release its still being updated with OS revisions...
Moto may prove me wrong, and Verizon may try to throw a wrench in the gears, but I will err on the side of caution and go as far as to say, that it seems "pointless" to me to continue selling a device for what amounts to $150-$400 and not be willing to maintain updates of said device. That would be a fine way of having your customers leave your service and manufacturer and go somewhere else...