>>But that would be in the future. Anything in the past shouldn't have been affected with anything so drastic as a ban. Right?
>
>Everything new in there would apply from that point and it may requires a checkbox somewhere to be checked by each member to demonstrates the ongoing agreement with a new set of rules, if that would ever be the case.

I remember enough business law from college to save you a step there. For a contract or element of a contract to be legally enforceable, there must be "consideration" -- each side must give something and get something. What you are describing is the classic example of one party not getting anything in return. A more typical case is where a company wants to modify employee contracts to add a new requirement or restriction. Unless they give the employee(s) something in return, such modifications are not enforceable.

For new members, of course, you can word the agreement any way you like.