Bitcoin seems to stay at around 50% of the total market capitalisation of cryptos, and I believe that it is here to stay for the long term. Many of the new cryptos seem to fall off the tree fairly quickly. The Lindy effect states that the longer an entity survives, the longer it will survive in the future. Obviously this doesn't apply to perishable goods, but I believe that it applies to creations such as Bitcoin.
Wikipedia has a fairly detailed article about the origin and development of the concept.
The Lindy effect - a description