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.
Thoughts?

Could be possible! But newly created cryptos are not really the matter of concern for the governments. The main concern is related to the big cryptoa with active markets. So having a law that prohibits creating a new cryptocurrency will not address the issue.
Governments around the world, are working to impose a blanket ban on cryptos, especially the third world countries. But in first world countries, we are observing somewhat friendly behavior from the government towards cryptos.
But frankly, having a negative law doesn't really affect the crypto market because it's technically very difficult to enforce the law on cryptos due to its anonymity factor.