If the government bans anything then it becomes more popular in the residents of the country.
It's not like drugs or porn. They're fun and they address desires that are as old as our DNA.
Bitcoin's selling point is its utility. Take away the ability to openly utilise it in said country and who is going to put money into something they can't spend and others won't want or accept?
I'm not gonna think 'goddamn it that sounds desirable.' I'm gonna think 'Fuck that.'
Sure, there's black markets, hiding money, transferring it across borders but that's relatively niche. If BTC was made effectively useless tomorrow I struggle to see how that's going to turn people on. There are plenty of other options for them.
After government bans Bitcoin then people search for a reason of it.
Then they see that someone was buying drugs with bitcoin
anonymously then they think that heck yeah I finally found a way to do this. And bang Bitcoin is adapted by them.
But in second thought, whole country cannot be a drug abuser.