Otherwise, we're living in a world where contracts between two parties mean nothing. Anyone can pull out of anything at any time for any reason, with no notice.

Otherwise, we're living in a world where contracts between two parties mean nothing. Anyone can pull out of anything at any time for any reason, with no notice. Not if the contract stipulates that both parties must agree to unwind the relationship. We already live in a world where anyone can pull out of anything at any time for any reason, with no notice - however if the contract says you can't do that then you open yourself up to legal liability. That doesn't stop most folks.