Just look what happened to Disney's stock when ESPN had a tiny, tiny, miniscule drop in subscribers; and Disney has an enormous number of other sources of revenue (theme parks, movie studios, video games, broadcast networks).
If you think Viacom is going to play hardball this time around you're not paying attention. They can't afford to lose someone as big as Dish for even a little bit, and Charlie is the kind of guy who would walk around and talk like any blackout was permanent. A reasonably sized, but relatively small cable company dropped Viacom permanently and they didn't see any appreciable drop in TV subscribers. Don't think Charlie doesn't know that. Heck, he's probably already used that against Viacom in the negotiations.