This altcoin massacre made me ponder what the coin market cap listing should look like, if this stuff was based on real fundamental value and not pure pump-and-dump speculation. I'd put XMR and ETH at a very distant second and third to BTC, since they each provide some very real features over BTC which people are using right now to good effect (though each has problems). I haven't looked into the more recent ones much, though. Are there any others that are backed by more than empty promises?
Adoption is the key to survival much more than features.
A coin can still succeed even if it doesn't provide a distinct benefit over another coin. Consider that there are several rental car companies even though there is little incentive to prefer one to another.
There are a number of coins that don't really offer more than Bitcoin but they can be used and exchanged for goods and services. LTC, DOGE and BCH all pretty much serve the same purpose but they stand out from a lot of others because you can actually spend them. Even CLAM will survive as long as JustDice does. The massacre is going to hit the coins that can only be traded at an exchange and have no other function.
This massacre talk started with that
Tweet from Ted Rogers saying that 90%+ listed at CoinMarketCap will disappear eventually. I'd be hard-pressed to come up with a list of 100 coins that I could exchange for goods or services.