As crypto/Blockchain tech becomes more popular, mainstream banks and governments will be forced to take action against this emerging industry to stop its growth worldwide. They don't want to people to use crypto on top of Fiat, so we'll be seeing new tactics from said entities in order to destroy crypto for good. One of those tactics could be either banning people from trading crypto at a centralized exchange or simply prosecuting developers of a cryptocurrency project. I believe the latter option is much easier and effective for governments to put an end to crypto for good. Before devs will be able to launch a new cryptocurrency, they're going to need governments' approval. Otherwise, they could face serious consequences in the long run.
It is possible for government to support/ignore a new cryptocurreny but only after they legalize the use of cryptos within their jurisdictions. I mean if government hate about having lots of cryptos and when they are advising their citizens about not risking with new things then there will be a healthy environment for investors. This will become possible for governments to analyze the projects to conclude about their worthiness before declaring about it legal level to their citizens.