I agree with you!
But, stop, stop, let me say.
You have some logic confusions:
"Is the very idea of having objective meaning" - you put "the idea" to proposition stance about object, but idea predicatives to object meaning. So at first you should to identify what is frist and what is follower. Idea is first and objective meaning is following, or meaning is first and idea is at proposition stance? To be agree - it is an act of objectification, people can change their mind decision, they would be disagree at next moment, they are able to think, they can keep silence - they are not robots yet.
If all people subscribe the contract, new people ll born soon, what then? New X religion?
But objective meaning is only what exist. Existence it is the world of signifies. You have to change word mean to signifier and all is ok, just make new meaningless euphemism and you ll see pure reality of existance.