Well I think it is a matter of project quality.
A lot of past project are inactive and clear scam and for those is starting the delisting.
Other projects are active and tokens useful for the project and for earning generated so it is a matter of quality.
Ye I think project quality will 100% be the deciding factor. The technology is there. It has underlying value and use cases that are still yet unknown so I don't think alts will go anywhere...given then utilise the tech
It's actually how the investors perceive the cryptocurrency and how valuable it will be to them that will determine the future of the coin and it's survival and we cannot deny that most of these coins are scams so that people can dole out their cash to invest in through the various ICOs.