Sorry but I'd say $50 - $60

Short term Etherium could do well but long term it hasn't got a hope in hell when the reality is there is a lot of better dapp protocols now. Etherium can only sustain its first to market position for a short period of time before developers start asking Why can't I do that on Etherium? This is a big problem for Etherium. Currently, Etherium is ok because all of these other competing protocols haven't got many Dapps yet but this WILL change. When Etherium developers start to see whats possible elsewhere but not on Etherium they will switch.

This is not FUD or an attack directed at Etherium, I am just pointing out the reality of what will happen with absolute certainty. Etherium would need to be very different to keep its market cap.

The $50 - $60 dollar mark is generous based on sentiment.