who were able to compete with bitcoins in terms of marketcap. Ethereum is the most traded altcoins in the market nowadays
and some experts believe it will overtake bitcoin in the future in terms of profitability.
Read my reply again, I said "some of them offer some good things on paper(like contracts in Eth)" but again this does not change the fact that everybody wants to jump on the wagon created by Bitcoin. Pretty much every alt coin promises something that Bitcoin doesn't have. That's their selling point after all. The thing is though do we really need those things they promise? I'm not against Eth btw, I'm following it closely.
I also don't think marketcap is a good metric for coin strength.
I wonder if a coin will come along that offers everything all of the altcoins do, and more. Think about early social media such as MySpace. Clearly it was missing something or it would still be around... and now we have Facebook. Eventually a coin might appear with far more features and ease-of-use then BTC and everyone will jump ship just like Facebook.