For people who are unfamiliar with Opus Dei, the whole point of the organization is to cultivate a robust Catholic lay spirituality. Removing the supernumeraries is practically destroying the whole purpose of the organization.
And to say that Mary "wasn't born a saint, but became a saint" sounds like heresy to my ears.
It would be just one of the many heresies of Bergoglio, e.g. some of God's laws are just too harsh for one to even be capable of obeying.