So what is the solution ? Is it possible to have one system that suits the government and the people at the same time? The question is: If we get one system that is fast, low-fee, decentralized and private, will governments agree to adopt?
It contradicts the whole system, if you're looking for decentralization and privacy, if you ask government to adopt it, they will ruin the decentralization and privacy.
The question is in another way: If Bitcoin were developed to solve all these problems and we obtained the required speed and low fees, would governments agree to adopt mass payments with Bitcoin?
Unfortunately Bitcoin isn't private, anyone can see all address, balance and history on the explorer. Fast, low fee, decentralized and private are suit to Monero, but there are many centralized exchanges already delist Monero. So there's no way the government will adopt Monero.