Are my coins going to last is it likely?
Of the five altcoins I am very sure that ethereum will last for the next five years, but I am not sure about the rest of the altcoins of the five altcoins and if you have a little ethereum try to keep it for the next five years and let's see the results as a place for investment future.
all of the tokens mentioned by the OP already have great support from investors and also have a large community including Avalanche, then all of the tokens above will continue to last even for the next 10 - 20 years.
but what I'm most worried about is the potential for the tokens above to change names or networks (because developers change name the tokens or collaborate with other chains).