Definitely it is,and that is one of the reason why ethereum is on the top of the list when it comes to altcoins. And also the stability of the ethereum is already proven for many years and that is why it is really supported by a lot of people and investors all over the world.
I believe that Ethereum is worth taking the risk. It has been on top of most of the cryptocurrencies therefore keeping or holding Ethereum for quite long time is beneficial for you. I think that its value will still rise given the time and that more people will recognize it the same way I do.