Suggestion: it depends on the harm it causes in the meantime.
If an emerging technology isn’t living up to its promise and the downside is the creators wasting their time, let it go on indefinitely. Maybe they’re having fun. As long as no one is getting hurt, it’s a hobby.
If the emerging technology is solving nothing and actively creating new problems, allowing bad actors to consistently hurt others with little to no consequences, and accelerating our demise so a handful of egoistic maniacs can see a number go up in their bank accounts, perhaps it’s time to stop. Put an end to it even sooner if the biggest proponents repeatedly lie and make promises which fail to materialise year after year.