I think bitcoin will lead the currency market because it was created as a way for people to send money over the internet. There are many advantages of bitcoin like Direct Transfer, Greater Liquidity, Security and so on. Bitcoin's maximum supply is limited to 21 million coins. Cryptocurrency gains value when demand rises higher than supply. for that i think bitcoin will lead the currency market in near 5 years. Which currency you think will lead?
you have already answered the question and anyone who says otherwise does not understand all the differences between bitcoin and altcoins.
we will certainly have exploits, and certain coins will be able to perform really well but otherwise I don't think there is a need to find a new "standard" that is not bitcoin.