I doubt the dev community will go after the X2 as hard as the X.
The X was a real flagship phone, better by far than anything else in the lineup at the time. The X2 is just an incremental upgrade - only a year after the X, so 2-year contract people aren't out of their contracts, and probably not a substantial enough upgrade to entice people to drop the cash on an early upgrade.
I think a lot of X owners are in the same boat I am - pretty happy with their phones, excited about the 2nd-init options we have now, and don't see the X2 as enough of an upgrade to warrant the extra bucks without a contract discount. There are newer, flashier phones like the Galaxy S II and the Bionic waiting in the wings, with the S2 definitely having an unlocked bootloader, and the Bionic might follow the Atrix and have an unlocked bootloader as well.
So, not much reason to jump ship, and when I do make a move, it will be to leapfrog the X2 and move straight to another phone.