People observing this PR exercise could well see it as just another 'protestant' church (albeit of short duration) wanting closer ties with Rome and even integration if the terms were right. Gone are the days of seeing oneself as the last of the few carrying the flame for the Church.
The reasoning of Fr. R on behalf of Menzingen starts with the post-V2 church recognising the Society, then kicking it out followed by years of negotiation with the irregularity slowly being reduced and finally ending. Doctrine has no part to play in a practical solution. In no way can it now be denied that the ultimate objective of the modern SSPX is to co-exist alongside other Ecclesia Dei bodies inside the conciliar church. And if Rome does not want it, it can pretend that but for internal church politics it is always a willing particpant.