No one knows if they would still be existing after several years. You can compare these projects to the old ones that once became popular and then no longer popular in the current time.
Time is a powerful indicator for one project. If one project is able to enjoy a cycle of four year in crypto, survives and has good communities, volume on exchanges, it can be a good project. Although that project can be a good one, it does not equal to better than bitcoin. If any team try to seed their project is better than bitcoin, it is their advertisement and self assessment, that is unreliable. I enjoyed the market in 2018 and I saw many shit altcoins have prices higher than $50, $100 for nonsense. They are dead now or months ago.
I think that's a good timeframe for most projects. If they will stay up to 4 years then they will able to survive for the longer term. Most projects are only showing their goodness at the beginning but being forgotten what they've showed to their investors.
Real use is no longer appropriate to them as long as they deliver their token into an exchange and become tradable. That bear market on 2018 have extinguished a lot of tokens that really have no usable purpose.