Its impossible to have one or two coins in crypto space because one or two coins can't solve all the problems we have in this world in every aspect of technology or others, if you want to keep a coin for a long time make sure the coin or token solves one or two problems in crypto space or the world, this type of coins don't die easily because they have real use cases, its simple as that
Relevance is one of the keys for the coin's survival. As long as the coin is useful for many and meets what it promised, it will surely succeed and has greater chances to expand more in the industry. Likely, this world has many problems to be solved that we indeed need more than one coin for it.