I think it will be possible.
Think to Facebook: Instagram platform will cross it in next future, a lot of young people switched to instagram.
Everything need to be innovative in next future to stay live, and ethereum is a good technology.
Ethereum is a very good and potential coin, many practical applications are also using ETH but for me to replace Bitcoin is very unlikely even though it is ETH. Bitcoin still has a great place in this market and to replace it is extremely difficult. The innovation will be good but sustainable value will survive with time.