Actually, that's a pretty good idea. A site with no fancy profiles, just some really light filtering for age and location, and then a parade of people you can video chat with for 30 seconds. As the 30 seconds winds down, both partners have to press a big "greenlight" button to continue chatting.
This might be like skydiving for some people but I bet it would ultimately make them more confident. And it could be sort of addicting -- if you hate this guy/girl, just wait a few seconds.