No, they won't but local banks aren't necessarily gone forever. There are several campaigns running currently to raise awareness of local banks and credit unions and encourage people to use them instead of the mega banks.
Once they're a mega bank it's hard for them to act in an ethical manner because things are so competitive regarding the big money accounts.
Local banks are still around and they'll keep being around if you and others open an account with them. You get the more personal service and lower fees. Available ATMs might not be as convenient but if they're part of PLUS or other ATM network, it's just as convenient.