Even if governments release their digital Fedcoins, I doubt people will want to exchange their bitcoins for those centralized coins. Governments can force people to start using Fedcoins if they replace fiat with them. So it is possible that Fedcoins will have more users than bitcoin. But people who understand the purpose and mission of bitcoin will not sell them. They will just keep hodling or they will start trading in buying goods in smaller closed societies.
And I really doubt if the government will do that because that is quite risky...they don't what will be the fallout in case they will push that kind of plan and with the government being inept and corrupt that project can be the target of many interventions and what-nots from powerful politicians which can result the project to become chaotic in the first place. I always believe that the government will instead regulated Bitcoin and cryptocurrency rather than create a potentially much bigger headache by having its own creation forced into the throats of the public.