The fifth paragraph of the page in this link is quite revealing. It says:
"About the Mass, he [Father Wegner] mentioned that the return to the Mass of St. Pius V would not be possible, and that the day when apostate Rome would become Catholic again (is it possible?) it would be a mass of another kind, a mixture of the traditional Mass with the modern. From his reply, one can clearly recall the Pius-Paul mass of Father Celier."
This statement shows that Father Wegner is ready to consider Rome "Catholic again" if it would have a hybrid mass.
I would only consider Rome "Catholic again" if it went back to the Traditional Mass.