I am of the opinion that hypervolatility is a key feature of cryptocurrencies which cannot be taken away. The only way around this was the creation of the stable coins which we already have.  Another reason why I believe that Ether might never get to attain stability is because it's price is largely tied to the demand and supply of other cryptocurrencies. If other altcoins are on the rise, you can definitely expect Ether to go the same route and vice versa. All this is just my personal opinion. To be truly sure about anything, we really do have to wait for the future being spoken about to come.