It must be true, think about altcoins we have. Think about how many altcoins we had in the past. Do you remember all of it? Many of them now do not exist because they have been replaced by better and more innovative ones and this will be repeated over and over.
Many altcoins were created for a certain type of business and if this business is still working, and even more so developing, then the token will exist for a very long time. Even if there is a need to replace an outdated token, then they will simply send new tokens to the wallets of the holders of the old tokens.
I do not think that in five years almost all current tokens will disappear. Of course, this process will constantly occur, but the figure of 99 percent is too high.