The market goes down and scam projects or projects that are not developed will soon die. Those projects will not be able to survive in the present circumstances. I have seen a lot of altcoin outside the top 300. Their prices have been continuously reduced since January and to the present it is almost dead. The market will grow with good projects
The only problem is that, it is so hard to see it this way right now. I just hope that just as you say, only the good coins will be left in the market and I hope that all scammers go rot in hell.