Come on, this is such a long shout to even imagine it possible. It’s something that wouldn’t even happen, even in a case where Bitcoin is accepted for exchange or recognized by governments of the world. What would that say about fiat currency?
It would completely undermine the power of the fiat currency. This is the government’s product we are talking about here and some means by which, they extend a great hold of power and control on its citizen and you want them to take that way from themselves? Nope, they wouldn’t.
In the things I see possible, I don’t think this one would be the case if we still have governance and government.

Citizens might as well get comfortable with fiat because, it’s not going away. If anyone is obsessed with being paid with Bitcoin so badly while working a civil job, you could as well use your salary to buy Bitcoin after wards.