So, changing the bootloader...does that mean when Gingerbread comes out it won't be possible to get it?
Well, you can't go back (yet (TBH is "working on it")).
And considering the OTA patches.. are just that, patches.. (they verify you have the correct files, and if you do, then they modify them, not replace them)..
IF the OTA isn't the same as the LEAK, then you can't go forward either (TBH has assured everyone repeatedly that the OTA coming for the DroidX IS indeed the same as 2.3.320 leak).
Only time will tell.. great question though!
Bootloader should have nothing to do with updates moving forward. Team Black Hat has already figured out the bootloader is not what the issue seems to be currently. It is more in depth of an issue then that from what they are seeing as this point and time. And trust me it is being worked on as to what is causing some of these bricks.
What I mean by this is someone who had a brick from last week sent it to one of the TBH guys. He was able to get the 2.3.320 build up and running on it. Once he did he went to an extreme and started messing with the bootloader and was able to still have 2.3.320 running with any of the 3 different bootloaders ( ie 30.01,30.03, and 30.04).
Just give them time and I'm sure they will get it figured out. What I find interesting tho is what is going on. It seems to me like Moto STILL has NOT fixed or figured out the issue as to what bricks a device when being updated. We saw these same type of reports from folks who had a stock X and tried to get the 2.2 OTA update when VZW pushed it out. And low and behold what was reported people stuck on the M or bootlooping after pulling the OTA update and having it install going from 2.1 to 2.2.