You are already not free to do _anything_ you _want_ with your Bitcoin. Bitcoin is a protocol, which means you can only do what the rules of the protocol allow with your coins (e.g. you are not allowed to double spend them). I do understand it is technically basically impossible to stop _every_ spam/non monetary use of Bitcoin. But it is within the realm of possibilities, that the majority of users agrees that Bitcoin shall be a _monetary_ database and that changes which enforce this more strongly than now are necessary and feasible. If that happens, everybody else is still free to fork off and have their own protocol/network for other use cases.