I do not think that the situation of 2017 will repeat. Now investors became much more experience and they will not make the mistakes of 2017.
I agree that old investors became much more experience that they were in 2017. But if cryptocurrency will become popular again a lot of new investors will come and make the same mistakes.
Scammers becomes more experience to. But because a lot of scams people lost trust to the cryptocurrency and many of them stopped to invest not to lose their money.