The ethereum is a very promising coin. And at the moment this is one of the coins that can create competition Bitcoin. At the end of 18, this coin will pass a line of 2500 thousand dollars. Probably will reach and 3000 $.
I agree with you, I would be very surprised if ETH could pass 3000$ in 2018...nevertheless it would be a positive surprise for me

My only fear is that one of the many highly funded ERC20 based ICO could have some major trouble and somewhat compromise
ETH performance...however knock on wood
