I think most people who currently hold him in high regard would drop him like a hot potato if he went sede.
Initially, but it would build momentum over time. You'd have the sedevacantists of course joining him, and the possibly bringing in the Resistance, and perhaps large portions of those who currently got to SSPX Masses but are really sedevacantists at heart. Then, as their numbers grew, more would eventually join the movement. Bergoglio is so bad that it would just take one person to point out that the emperor has no clothes.