If Armstrong were to lose Tour de France titles, it would,
1A) Be really, really super freaking sweet dude
A) Sully the sport to the casual fans of cycling.
B) An investigation should be done on the subsequent riders who finished behind Armstrong, in the 1999-2005 victories.
B) is the only fair course of action by USADA, as it is important that no dopers should take the Tour titles which are bound to be stripped by Armstrong.
Any other course than a full investigation of Armstrongs' competitors would be a travesty of justice.
Also any results of any riders found to be doping during the Armstrong years should be stripped as well as lifetime bans and return of prizes with interest.
USADA should follow that course. This includes any informants who rode alongside Armstrong.
The cheaters should be destroyed, along with Armstrong if he is found guilty.