The technology itself cannot be centralized but in the event of compromise, the exchange sites, mining industries, and Bitcoin or crypto related platforms will become centralized. The governments can only impose regulations for the mentioned platforms to control the activities of Bitcoin and its transactions.
Yes I think it is nearly impossible to happen in the future but if the government will find its way to centralized it then it will be possible by registering our bitcoin address throug kyc I guess.
The government should create a new cryptocurrency and not bitcoin that they should modify. It will take a long process and modifying bitcoin system is difficult than creating another system. As we all know that bitcoin is being design as a decentralized in form so there is no way that governments could modify it. Aside from that it is so hard to unite a governments around the world so definitely it is near impossible to modify and change bitcoin.