I read a while back that at least the TDF officials were contemplating to simply have no official winners for those TDF's. No idea if that option is still on the table or if it ever was more than a rumour.
Really. They either have to rebuild the entire sport from scratch or remain hypocrites.
It's exactly as if the IFBB had decided to investigate and strip Schwarzenegger of his seven (coincidentally) Olympia wins. Everyone on the stage was juiced, and still is.