Indeed, for many reasons. Let's say that all Traditional Catholics were able to unite in consensus, declare that they considered Jorge illegitimate, and elected their Pope. What would this Pope do? There's no doubt that the Modernist Conciliar hierarchy would simply ignore him and treat him as if he were no different than another Pope Michael.
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He would excommunicate all the modernists. What the condemned heretics' reaction would be at that point is about as relevant as what your local protestant minister thinks about your religious beliefs.
First thing a legitimate Pope would need to do would be to depose all the Conciliar bishops (formally and officially). They'd just laugh at that.
Is this a problem? At this point they would be as much Catholic bishops as Osama bin Laden was.
No way those Modernists are just going to vacate their dioceses, etc.
They already did, as soon as they were excommunicated by a true pope. There's no need for them to physically move out of the boundaries of that diocese.
There's no way that the True Church would reclaim the material offices of the Church and there would be a restoration of the Church.
An excommunication of said false bishops by a true pope would reclaim the material offices of the Church, especially once they were replaced with true Catholic bishops.
This would most certainly be a true restoration of the Church.
I think your point is that the heretics would retain possession of various stone buildings with signs in front of them saying things like "St. Joseph's Cathedral" or "Diocese of Scranton Chancery Office and Episcopal Residence". Well, those things are just buildings. Legal possession of such buildings does not confer any sort of office in the Church, especially after the legal owners of such buildings have been officially expelled from the Church.
You might as well ask what the point of excommunicating Queen Elizabeth was, since she would just laugh at the pope and would still retain possession of Westminster Cathedral.
So basically all you'd have is a more united Traditional movement with a widely-accepted leader ... little different than what Archbishop Lefebvre was to Traditional Catholics for a few decades. For all practical intents and purposes, nothing would really change.
Nobody thought Archbishop Lefebvre was the pope. A pope has supreme power in the Church and can authoritatively settle doctrinal disputes, and all Catholics would submit to his authority. This is something most desperately needed today, and at all times. The entire world we live in would change if we had a true pope.
Only God (through Our Lady) can fix this mess, and the solution would undoubtedly require both a new Holy Pope but also temporal support along the lines of a Great Monarch figure ... to act as an enforcer.
... to throw people physically out of buildings that used to belong to the Catholic Church? No, we don't need stone buildings. We need authority and a Catholic hierarchy. We can rebuild all the cathedrals and episcopal residences and chancery offices we need. That's the easy part.