To do otherwise, when you get right down to brass tacks, is tantamount to saying “the new rite of consecrating a bishop is doubtfully valid, and Ordaining Bishop X may not be a bishop at all”.
If the SSPX is “forced” to have ordinations by a bishop outside the church, it will be very important to see why.
It will most likely because no bishop would be willing to ordain their priests according to the status quo.
The major issue that the SSPX has is that the vast majority of their priests (eps the ones who are willing to go online and talk) believe that the Ordinary Form (while valid) is detrimental to the faith.
Their view is that that the prayers that were removed from the mass & the some of the common postures (like the priest’s back to the tabernacle) have unintended consequences (at best) of causing people not to believe in the teachings of the Church.
SSPX priests are not afraid to say these things online. Most other priests who agree with them, but who are in full communion with the Church, know not to discuss these things online.
As long as the SSPX officially/publicly takes the stance the Mass of Paul VI causes people to lose their faith, I can’t see many bishops being OK with them.
However, in the SSPX’s defense, I think it’s interesting how some people are quick to condemn the SSPX for their errors, but refuse to condemn other priests other heretical/schematic public statements, behavior, etc.
It seems to me that that any conservative/traditional heretical/schematic behavior/thoughts are quickly condemned, but any leftist heretical/schematic behavior/thoughts are often excused away or overlooked.
How about we just treat all heretical & schematic behavior/thoughts/actions all the same way?