Why holders have to pay taxes i don't think so. Taxes will only liable if someone trade bitcoin for exchange to fiat currency than we can think about pay taxes but for holding it is not liable.
But bro if govt. regulate exchanges where we have been traded than govt. will have our all details and transaction we made on particular exchange so according to me pay taxes can be good option for us if govt. allow crypto.
What will happen on BTC if the government will said that all the bitcoin holder have to pay their tax??
Maybe the expansion of BTC community will get low than usual.
The government can not control this. This is the advantage of blockchain technology and we do not have to worry about this. Besides that, I think those guys holding a lot of bitcoin will have people working in government. you will not know who is really who is fake in this market Maybe the expansion of BTC community will get low than usual.