I think you misunderstood me - I don't think that buying and holding any of the current tokens on CMC is a particularly good idea. You have a very very low chance of picking the ones that will be around in a few years. However, staying aware of what new development are coming around and trading into the new promising ones as they become successful may be a good growth strategy. I agree with you that 98%+ of the current coins will be dead in less than 5 years - but there will absolutely be new ones with an increasing amount of value.

There may well be a point in the coming months or years that the market cap of current crypto deflates - maybe by 90% or more - but new cryptocurrency applications and tokens will certainly exist in 5, 10, 15, and 100 years.