In Bitcoin-based transactions, about 76 billion US dollars of transactions are involved in illegal activities each year, accounting for about 46% of the total Bitcoin transactions. Almost a quarter of bitcoin users, and nearly half of bitcoin transactions, are illegal. Therefore, from a quantitative point of view, the use of Bitcoin is enough to become the target of attention of governments and international criminal police. If governments block Bitcoin, does Bitcoin have no value?
It may affect on the price of Bitcoin but bitcoin runs it's own way after getting some positive news. As bitcoin is Decentralised crypto, government isn't able to block bitcoin transaction. The value of Bitcoin will remain forever because it's the leading of crypto market.
Come to think that if it was totally possible for it to be blocked then government had already done this thing long time ago because they don't really like into something that totally opposes centralization which is on where Bitcoin is really known of.
They can block all they want but they cant completely make it stop and let bitcoin die because as long theres a community who had been using or simply on demand then Bitcoin would continue to live.
Demand is the key plus its technical aspects which is totally decentralized or cant simply be altered nor reverse and which do really make it great.