The worse part if that they can force people to use only their centralized digital currencies, forbidding bitcoin and other decentralized crypto currencies. What I most fear is a bitcoin confiscation ordered by authoritarian governments towards btcs held in centralized exchanges. If something like this happened, I believe exchanges would deliver all the coins to governments without chances of reverting the decision.
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If that happens then surely Bitcoin and other cryptos that are currently very high in price could return to like in 2018. But seeing this, it is not that easy for governments around the world to jointly ban and confiscate their people's Bitcoin and force to use a centralized one.  Although India has taken that policy in advance.  The US and many other countries are already open to developing technology.  They also need a competitor that is as equal as Bitcoin, does it already exist?