If ETH had crashed to 10$, they would not be devaluing pre-ico investment because they would not have been able to cover the loss. Basically investing with pre-ico money. Don't be surprised if by changing the terms & conditions of this sale/contribution/schlogginfitz or whatever we are calling it to stay out of legal trouble bites you in the ass down the road.
I think This fact will never happen in this week or this month or this year.
ETH is on the race and you can not see this price (10$ for ETH) in your dream.
Just get ready to join this ICO and it will finish ICO launching for only week .