Emercoin should be 10$ more
We will see $50.00 once smart contracts launch. End of 2017.
Where is a proof ?

I think he mean this -
Roadmap
There are two important milestones the Emercoin team are working towards implementing before the end of 2017:
Segwit (apply the last Bitcoin code)
Creation of Secure Smart Contracts
from
https://wiki.emercoin.com/en/Emercoin#Specifications . So now I'm thinking about selling Aeternity and buying on emercoin until the price is high.