I think that Sean Murphy earlier nailed the reason why women should be ordained - "With Mass attendance at 13% for gen x and 10%for millennials, there will not be any talk of a priest shortage soon." 

A celibate priesthood is a relic of an earlier period where it made perfect sense to a largely uneducated society comfortable with male authoritarian rule of all of their institutions. GenX'ers and millennials learn early from history and current events that such a ruling strategy today is intrinsically harmful (e.g. Hitler, Syria, Russia, North Korea, etc.) and they insist upon diversity at all levels of society.   Jesus' "Love they neighbor as thyself" admonition permeates their worldview but it is a worldview that conflicts with a Church that insists that women are unequal neighbors when it comes to spiritual responsibilities. 

Ordination of married men and women won't in itself bring back young people but it could signal a change that may help start reversing the trend.