If I want to add something to the memo protocol (let say private message) and you disagree/dont want to implement it then it'll fail and cause frustration for everyone
There are multiple apps that have added to the protocol. None have failed or caused frustration afaik.
To the memo protocol ? You are the only one developing it so you are the only one modifying the protocol. I don't think there is an alternative serious site that is a "memo clone"
The memo protocol is just OP_RETURN with prefixes. Just because they don't have large amounts of traffic doesn't mean they weren't able to add new prefixes.