Altcoin won't survive more than 5 years if they don't have a strong cummunity to create an unlimited demand, because new projects are happening almost everyday and they're ready to replace a coin that don't have demand anymore. So, only the strong coins with high demand right now that will survive in the future
Why 5 years? If there is no demand for any coin, it can be considered dead already. It will stay at the corner of the any shit exchange with zero volume.
That was to long to wait 5 years? Maybe it should not gonna happen about altcoins.
In this coming year will be have some improvements about altcoins, And you said must better the altcoins are not always stay in the shit exchange. If they want to be more popular must need to list in the trusted exchange.