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?
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. For that reason, I think that you will see several classes of coins having distinct use cases and then several coins in each class -- probably a single major coin and one or two lesser coins, along with a bunch of worthless coins. So, I would add LTC, DASH, and ZCash as minor coins to the list. I might add EOS to the list simply because it has a huge following and a ton of money.
There are also a few utility tokens that are actually being used today. Binance Coin (BNB) is going to have value as long as Binance is around.