Maybe a couple of the big name sponsors will disappear, and cycling will become more similar to the way it was a few years ago in team/sponsorship terms. Sponsors like Liquigas will remain in the picture, making for good country based teams interested in their national tours.
I wonder who will replace Disco, as there is little interest for a predominantly American team in Europe (from a European sponsor's point of view, who cares?). Also, I wonder what would happen to the remains of T-Mobile as they are another big spender that would be difficult to replace.
In other words, scaling back of sponsorships, as Helmut suggests. The sport will not die. Go to an Italian Gran Fondo for confirmation of the grassroots popularity of the sport, or check out the spectators at a Giro mountain finish, the Lombardia, or a muur in RVV. Don't worry.