I believe the main stumbling block nearly all people have is the false idea that the pope has limitless authority. This is a formidable stumbling block that must be overcome. Until you can get your husband convinced that this idea is altogether wrong, it's not likely he will change his mind.
Consider the following text I transcribed below as explained by Fr. Wathen in the interview he did with pre-sede Michael Dimond in the video I posted below. It will do you and especially your husband much good to listen to the whole interview as this whole issue is explained very clearly, and relatively, very briefly....
"People have been given the idea that whatever the pope has the authority to do he may morally do, we deny both that the pope has the authority to introduce a new mass and we insist that the introduction of a totally new Rite with a questionable theology, and that is putting it mildly, the introduction of a new Rite with a questionable theology is not only unlawful, that is, it goes clearly contrary to the established law, but it is immoral, independent of the law of which the pope is bound.
People have the idea that the pope, because he is the head of the Church, has limitless authority. This is altogether wrong. He is not at all limitless in what he may do, he is strictly bound to what he must do and he is bound to adhere to what has been established. The role and the duty of the pope is not only not to deviate from what has been established, but to make sure that all his subjects don’t deviate from it."
[...]
1) "As regards the Mass of the Roman Rite, there is only one, Pope St. Pius V said that there could never be but one, and he had the authority to impose this for all time.
2) If he did not have the authority to do so, even to the extent of binding all his successors, then this is to say that he, the pope, did not even know the limits of his own authority. This is to say that this pope attempted to do something which he had no authority to do.
3) And we say well then if he did not have that authority, then his authority was limited.
4) We say that if his authority is limited, then all his successors authority is limited also.
5) We say yes, the authority of the pope is limited, but it is not limited to establishing the liturgy of the Mass for all time.
6) Rather, it is limited to where a successor cannot discard this Mass because of a wish, whimsy or a deviation in Catholic belief.
7) And there has to be a deviation in Catholic belief on the part of Pope Paul VI who would introduce such a mass as what we have, the Novus Ordo Missae."