The SSPX has a special role to play in Church Restoration.
This is just pure sentimentalism, with no basis in Church History. Sure, throughout the ages, certain Saints and religious organizations played a role in turning the tide against heresy but these individuals and orders did not restore the Church; God did, through providing a good pope and the hierarchy. And those saints/orgs that helped during those faith-less time periods did 3 things consistantly:
1. Waged utter, all-out war against heresy and lukewarmness and error.
2. Preached spiritual goals, penance and conversion to sanctity.
3. Usually, in a temporal sense, had all kinds of failures, obstacles to success and attackers of all kinds, including from within the Church.
Think of the non-compromising, multiple-times excommunicated St Athanasius against Arianism; the preaching of St Dominic on the Rosary against the Albigensians (who tried to kill him); the loss of titles, friends and wealth of St Thomas More; the contradictions and sufferings of St Margaret Mary and the Sacred Heart; the challenges, perils and death threats against St Patrick; etc, etc, etc.
Does the new-sspx have obstacles from new-rome anymore? Are they facing persecution for protecting the Faith? Are they in a fight to save the Truth against the enemies in rome? No, no, and no. In fact, the new-sspx now boasts that they are being "friendly" with new-rome. How can you be friends with a person who wants to destroy what you love? Either you don't really love what you say you do (i.e. Truth and the Church), or you're just tired of fighting and you want a nice, easy life. Either way, you're a hypocrite and a wimp.
Does the new-sspx preach against V2 and the new mass as they used to do? Do they preach against Modernism and all its heresies, without compromise? Do they condemn V2 as an ambigious time-bomb of crappy theology and protestantized catholicity? No, they do not. Not anymore. Instead, +Fellay and friends preach that V2 is 95% ok and "only" 5% wrong.
Would you give a child a coca-cola with "only" 5% of anti-freeze in it? I hope not, cause they'd die very quickly.