Really depends on how the open firmware community decides to handle this, if they'll put their heads in the sand and say well FCC are bad and write to your representatives nothing will come out of it. If they work out a framework to prevent misuse of regulated equipment there's a good chance that thats what we'll see implemented.

And locking out the firmware might not be the easiest way to handle this if you are a manufacturer since you'll still need to provide updates and multiple software versions (even basic things like ISP branding), so you'll have to resort to using cryptography building in a secure boot/secure flash mechanism and such and such which isn't cheap to maintain, for you telling broadcom to just disable Channel X Y and Z in their radio might be a cheaper and easier option.