I'm waiting for interesting discussions from you
It's possible that none will ever be more valuable but there are a few that are starting to be worth more than $200. Both Etherium and Zcash have been above $200. Dash has either been above $200 or close to it. Those three right now appear to have the best chance to overtake bitcoin.
Bitcoin is the pioneer in crypto currencies.Its hard for any coin to be more expensive than bitcoin.Since bitcoin is pseudo anonymous,altcoins which provide full anonymity might get more support from investors.Now,some new coins are introduced which provide completely full anonymity.They might become expensive in the long run.