I agree—FPGAs are more efficient than GPUs, but their limited market availability and niche nature certainly don’t help with the token’s widespread adoption.
Fortunately for BNBTC, mining isn’t tied to the network’s security but only to its distribution method. As a result, the protection offered by the BNB Chain remains intact, and users can rest assured that a 51% attack won’t be possible even if a farm with a huge number of FPGAs—or even ASICs—were to appear overnight. I think this is a big advantage compared to all the other fairly distributed PoW-mined projects out there.
Anyway there are rumors that community developers are working on this specific topic... We’ll see what happens in the coming months... In any case, it will be up to the community to decide what to do if new proposals arise.