Things will definitely change over time, they might be against Bitcoin right now but there will be a time when the government will allow its citizens to use and trade Bitcoin without any restrictions, they can always regulate the usage and tax people based on that if it's the concern, but I believe the main concern for them is that they might start losing control over people if they get an alternative way of storing and using their personal wealth.
I am sure no government will allow trading or using Bitcoin without any restrictions.
Remember that the government has everything in order, providing the right regulations according to their research.
In fact, you answered yourself that the government's concern is that the use of Bitcoin is uncontrolled and decentralized.
Governments are not happy with that, they need to have control over everything.
So providing regulations according to the conditions of their country is mandatory.
Imposing taxes, regulating trading platforms and some bans are clear examples of governments wanting to control everything.
Most governments right now are against Bitcoin just because of this reason, but the countries and governments that understand the potential it has got are trying to do their best to adopt it and regulate it and make full use of the technology in their favor because they know it's a great innovation.
Countries that understand the potential of Bitcoin will be more free to provide regulations.
Real adoption will probably be done as happened in EL Salvador.
But, EL Salvador with BItcoin at this time seems to be getting worse, There are always pros and cons.
Bitcoin is a good future for payments, but it depends on how the government regulates it.