I have jump but just didn't use it, so I should still get it first lol
Since you weren't screwed by the lack of JUMP! having a working ordering system, probably not. This is to prevent those with a negative JUMP! experience from leaving and discouraging customers from signing up for the service.
If the JUMP! priority promise is actually fulfilled, this could work in T-Mobile's advantage by encouraging more users to sign up for the service for that chance of priority when pre-ordering devices in the future.
----------
Let's all keep in mind that they're saying they'll prioritize JUMP! preorders. But nobody knows what they'll actually do in their corner offices on the 40th floor. They may be just saying that to pacify JUMPers and have plans to keep it first come, first served.
Well, that's most likely not the case. I mean, it wouldn't be difficult to tell if they lied if JUMP! users are receiving their devices days/weeks after everyone else. By lying, T-Mobile will not only destroy the JUMP! program, they would probably cause many to leave due to their dishonesty instead of just having users drop JUMP!