I do not believe staying with someone, "no matter what", is a good solution. Everyone is making compromises. I just don't see a happy outcome. Sure many wives are forced to settle and make the best of a difficult, to put it mildly, situation. As mentioned above she is faced with her own personal needs being forced down by her responsibility to her children or any myriad of pressures from gender counseling or therapists.
It is my personal opinion that the responsibility for the consequences of transition lies with the person making the change. "Boiling the frog slowly" might work for cooking frogs, but should not be applied to the woman you married as the man you apparently knew you were not.