I think Ethereum can not sustain a certain price. If you are a good follower of Ethereum market prices, you understand that ether has never at any time resisted or maintain a consistent price hight for up to one week. In the last few days, Ethereum touched $250, and now back to below $230 as at the time of writing this post. I think that there are some altcoins that has stronger resistance going to price deep than Ethereum. This is my opinion.