Have you seen the ETHEREUM forums?
All gung ho with wild predictions, people pimping the latest ICO, weird words like HODL being thrown around... it's like a casino.
So, here is my answer:
It all depends what projects people decide to support.
If people continue to "invest" in whatever takes their fancy while doing no research and fuel an insane bubble, then it could be $40 (if it bursts) or it could be $500 or more, but the next week, who knows?.
If people start thinking that they, themselves can help pilot the growth by doing some serious research and asking for better disclosure in whitepapers, investing in credible projects that will advance Ethereum as a platform, ones where the founders have some real world experience, where advisors state their involvement, where the company has a real address. Never mind if the project is sexy or mundane as long as it provides proof of the power of the platform and encourages further adoption.
You can do your bit by investing a bit in each one that makes sense without expecting an immediate flip of 20x, then you will guarantee log term growth of the value of your ETH.