I don't buy that switching to the SSPX would be tantamount to "staying inside the Novus Ordo". While they've gradually become infected with various Modernist tendencies (depending on the priest), this is like the guy at Traditio claiming that the 1962 Tridentine Missal is "half Novus Ordo". Not just yet anyway.
Once they ban the Tridentine Mass, the remaining Motarians who don't have access to an FSSP chapel will be forced to get off the fence and decide whether they're going over to SSPX or remaining with the Conciliar Church. There won't be any more of the "have your cake and eat it too" situations (again, outside of FSSP), i.e. "have your Tridentine Mass and be in the Conciliar Church too".
Once this happens, the next phase will likely be to introduce some additional modernizations into FFSP, and continuing talks to re-absorb SSPX as well. Alternatively, or additionally, the plan will likely be to introduce some Trojan horse non-bishops, ala Huonder, for the upcoming "consecrations" and render the SSPX ordinations going forward invalid.
Well, you see, I believe that the SSPX has become "regularized," only it has done so in secret. It's like a couple that eloped, but hasn't yet gotten up the guts to tell the parents.
How is it that a) they now have faculties for the Sacrament of Penance and marriages; and b) they are categorically obedient on the question of consecrating new bishops (they should have made new bishops a long, long time ago); and c) they let a novus ordo "bishop" corrupt their Holy Oils; and d) they are letting laymen in priest costumes service their chapels; and e) they kept their mouths shut when fiducia supplicans and other monstrosities came out; and f) their priests and bishops use novus ordo "churches" for sacramental ceremonies?
It think it is logically impossible that they simultaneously hold on to their independence and do these gravely sinful things. It is also logically impossible that the novus ordo has given what it's given without getting something in return. SSPX "disobedience" died somewhere before 2013. They have submitted. They are formal subjects of the false hierarchy - of the false church; and worse, they are hiding it from their donor base. That's the lowest form of low.
And it's no coincidence that, having done a very dirty deed in the dark, while clothing themselves as angels of light, their dirty little scandals, nay their integral corruptions, are now oozing out in public like hot brie in puff pastry.
God sees in secret.
I believe they cut a deal with Ratzinger. His work now being done, he retired. This new thrust is the next phase in one single plan. I think the SSPX is now part and parcel of the conciliar beast; and it cannot get out now, even if it tried. I think they've been Epsteined in some way.