Everytime a drug scandal happens, the Sport looses a little credibilty, and some fans, and some sponsors go away. Then there's an effort to clean thing up, and a new era is launched. (See Festina).
Over time as the cycle repeats itself, and the new era is just like the old, more people begin to say who cares.
My prediction is that this time it will be a deep hit to the sport, worse than Festina.
A number of sponsors will go, salaries will drop, viewership and interest, particularly outside core cycling countries will drop substantially, and a lot of coverage will dissappear.
But it won't be the end of the sport by any means. Fans on the side of the road will continue to show up in large numbers. No major races will fold.
And gradually interest will grow again, and TV, Sponsors, and Money will come back.
But I think its going to hurt this time.