LOI, the sad thing is most people under the age of 40-45 have never experienced real Catholicism. Those who by the grace of God get the chance understand what we have now are two different religions.
We get to choose the Catholicism of 19+ centuries or the new Catholicism of 40 years. We must choose between true obedience to God or false obedience to men promoting error.
The first 19 centuries you speak of were not all idyllic. There were many periods, if not most, when the light seemed almost to extinguish.
Name me one Saint that decided to start his own Church in order to combat the heresies. St. Athanasius? St. Catherine of Siena? Bl. Anne Catherine Emerich? Ummm, none of those.
St. Martin Luther? St. whathisname Calvin? St. Zwingli? yes!
What is needed is people like yourselves, and a million more, to face the problem from WITHIN. God, in His time, will raise another St. Athanasius, or St. Catherine, to gather the people and to counsel Popes. Don't settle for illicit, possibly non existant Sacraments.
As 'stubborn' has written in his tagline "it's all about the Mass", so has Jesus, in His mercy, given us a refuge in the indult Mass. That may be the niche in the Novus Ordo armour that will bring them down. The Tridenine Mass said by licit Priests.
I know you are all well read, knowledgeable Catholics, and have read St. Catherines "Dialogue", but may I suggest re-aquainting yourself wth it, specifically the chapters on fallen Priests, and the nature of the Church.
I would be very careful about being so cavalier in leading people away from the established Church. Those words might just have to be accounted for at some point.
I am all for 'opposing them to their face' to bring about change, but not as far as creating a man made Church. Go to the indult Mass and pray hard for the glory of Christ's Church on earth, but don't create your own Church.