I believe it will not affect an ongoing ICO project as long as the project is genuine with very high potential to hit in the market.
Sometimes, it's how the team promotes their project. There are times that crap projects with very articulate marketing team can acquire huge amount of money, while an innovative one with poor marketing can't even get an audience from the community.
So long that a project is authentic in their goals and has very strong team, I think the eth price is not that significant. Maybe, you can buy more tokens now with the current value.

Promotion indeed plays a big role to the overall success of an ICO. So, in your case, if you come across a great project and you have the funds to invest, you wouldn't consider putting off your investment even if ETH appears to fall below 200USD again?