I honestly believe that if the Traditional movement could "slough off" the dogmatic positions on either pole of this issue, there could be a real hope for unity.
As it is, those exert a polarizing effect on the entire Traditional movement, just like when you pull two opposite ends of a rubber band, everything in between also streches apart.
If we were to slap the fingers of those dogmatic types off Traditional Catholicism, it might end up taking its rightful shape.
Now, that does not mean there would not remain differences of opinion, or that every group could work together, practically speaking, since one group might use this version of the Mass or Holy Week Rites, another another, one might put "una cuм Prevosto [sic]" into the Canon, another not, and some migh have doubts about the Holy Orders of some other groups [more on that in second]. But ... so what? We've always had different theological schools. You had Thomist and Molinists calling each other heretics until the Pope intervened and told them to knock it off. But outside of that you have different Rites, different spiritualities, different religious Orders, etc. But the key thing is that these would be academic differences and no longer rise to the level of a schismatic attitude where those other who disagree with yoou should be refused the Sacraments and declared non-Catholics. That's the difference.
While Father Jenkins was more moderate on the "doubtist" type of position, sadly he's gone along with the SSPV line (that I don't think he naturally would be inclined toward) that anyone who goes to a CMRI chapel or to a +Thuc-line priest should be refused Communion. Now, you could OPINE that +Thuc Orders are positively doubtful, or that CMRI are problematic, and warn the faithful ... but WHO DIED AND MADE SSPV POPES? How can you impose your opinion (a weak one at that) regarding the validity of the +Thuc lie on the consciences of the faithful and then weaponize threats of withholding the Sacraments against them? You should warn them if you sincerely believe it ... "I think you're jeopardizing your soul if you keep doing that." ... but who are you to refuse Sacraments to those who disagree? As for CMRI being "schismatic" because +Shuckhardt received Orders from Old Roman Catholic Daniel Brown ... not only do CMRI insist that Brown had repudiated any errors he had held before conferring Orders, but Canon Law does not consider someone schismatic just for obtaining Orders from a non-Catholic ... but the penalty was suspension. Besides that, they don't even know the difference between Old Roman Catholics (not heretics but formerly schismatic, except ... if there's no Pope that's a tough accusation) and Old Catholics (heretics).
Finally, with regard to Holy Orders, I get disgusted at those who attack others for doubtful Orders almost as if they enjoy having some weapon they could use against their adversaries. If some do have invalid Orders, that's a horrible and tragic situation, and nothing to relish. See, a real Catholic with Christian charity would deplore the situation and ... OFFER TO CONDITIONALL CONSECRATE. "Hey, Father(Bishop?) Dolan ... since you have questionable Orders, now that I have valid Orders, why don't I offer you a conditional. You needn't admit thereby that you considered them doubtful, but we could both say that it's in the interests of bringing peace to consciences, and you could conditionall consecrate me also." What we need is a Rebiba 2.0, someone who had conditional Orders from all the main Traditional lines out there, who would then conditioonally ordain any priests or bishiops out there.