With the current demand, Ethereum can't go much higher. Ethereum is a platform and in the future when Ethereum becomes huge and globally accepted we can see the price at $5000. $500 is a good price for many of us, and I think that after Bitcoin halving when Bitcoin starts to rise, Ethereum will get to that price! It can go higher, but it will take more time for that. People should wish big things, but we need to have reasonable predictions and to not expect too much!