No, frankly, any more than they NEED my materially heretical family members (they’re all Baptists). Certainly, everyone needs to come home to the unity of the Church, the obedience of the legitimate, Christ-ordained authority. We need them ALL in the sense that it is the desire of the Savior that we all be one (the 99 left safe in the fold while He goes in search of the one that’s lost), but that unity is already possessed by the Church and those outside of it are the ones lacking.
What concerns me is the attitude that we will be welcoming these people back not with compassion and understanding (we’ve all sinned, we’re all prodigals in one sense or the other, and just like in the Parable of the Prodigal, we shouldn’t cop an attitude like the elder brother), but as though they were conquering heroes, come back to fix the Church. They’re not, not in the least. They’re excommunicate bishops (and, in at least one instance that I can think of, heretics) and priests who’ve been suspended ad divinis from the celebration of the Sacraments. They were and are wrong. Of course, they can continue to illicitly consecrate bishops. So could other schismatics throughout the centuries. It’s not that big a stick at all. And this isn’t the same as with the Eastern Orthodox. The SSPX isn’t the other lung. They were a part of THIS lung and they departed in disobedience.