I do think mass adoption is possible but it will not directly come through the government. If the economy collapses, then local businesses will look for an alternative to fiat currencies and bitcoin can be a good option for them. Like Venezuela, Jordan has gone through this same situation. Bitcoin can be used by local businesses in these countries local business as P2P payment network which will start the process of mass adoption of bitcoin in a country.
Another example is Zimbabwe with its extreme inflation.
The adoption of bitcoin may be another alternative to overcome this inflation, but regulations must really be implemented and there must be someone who regulates how Bitcoin should be used.
Mass adoption cannot necessarily be used just like that, there must be an in-depth study of what is needed and how it applies to the economic system in a country.
Using the P2P network or using the Bitcoin Lightning network can be an alternative.
Mass adoption is not only thinking about a benefit for the country, but also thinking about how people can use it or not and whether it is really useful or not.
To overcome inflation with Bitcoin may not be appropriate because there are many factors related to the government's internal and external policies in dealing with the country's inflation. If the local government's role is still wrong in tackling inflation, investing or purchasing BTC, even to the point of determining BTC as the main currency, it will actually add new problems for the country and even its people.
Apart from that, if there is network congestion on the BTC Blockchain which causes transaction costs to rise, it could also pose a big dilemma for the country, which could cause economic congestion.
Maybe if it were just an alternative, Bitcoin would be able to fill this void and be ready to be adopted as an alternative in various fields in every country in the world.