If you're not so sure on the idea but want to do a test, do what 4chan did for their new boards. They did trials for every new board that they put out, if the board does well, it will stay around. But if something goes wrong or another concept turns out to be better, they'll close down the board and/or redirect people to the replacement.

Simple, do a test, give it like a year or less and see if it works out.