This is a fantastic idea, bitcoin has the multi-sig function, so why not use it ?
I agree, especially when 250 BTC of forum funds have already been lost. Even though it wasn't lost due to scamming (as far as people know), people die due to freak accidents all the time. 2-of-3 multisig would be an option, but the forum could also consider 3 or 4-of-5 multisig as well. That way a majority would be required to move coins but you could still be missing a few key owners to move coins (ex. 3-of-5 would work even if two key owners went MIA at the same time).