I do agree that all the army builder type figures should be open ended but that kinda goes against the limited collectible part of these figures.
I personally wouldn't mind it at all if they didn't set any kind of edition size for the army builder figures and continue making them available for up to a year. I know if that were the case with Stormtroopers for example, instead of just getting two, there's no telling how many I would accumulate if I could space them out and order them during slow times for SS.
Again, I don't see this happening, bigger ES maybe, unlimted highly doubtfull.