What is worse than active homosexuality is the claim that God purposely created homosexuals and approves such behaviour.
You credit Fr Martin with saying that in time the Church will have to acknowledge that homosexuality and gender fluency, whatever that might be, are a given. If he did then his critics are right about him. He is advocating what the Church regards as a serious sin. Fr Martin claims that he has written or said nothing against the Church's teaching. Who is correct, you or he?
The Church cannot loose on earth what is bound in heaven so there is not the remotest possibility that at any time in the future this teaching will change. Even if it were to reverse its teaching then it would simply cease to be Christ's Church.