I will not expect high prices for Ethereum until the end of the year Because I see Ethereum prices are just holding out and falling maybe $ 500 is a good deal for ethereum until end of 2020
It can be more with the progress of ethereum 2.0
The scalability is not yet updated. I think that we are still in the early stage. There was a bunch of updates that will have implemented in the future. It's just a matter of time until ether will break another resistance.