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
facebook's libra would be that coin, but goverments take it as a harm for their own economy, but I think they have their excuses.
but, anyway, I think that problem would very hard to solve