I'm not convinced that what you're saying is entirely fair. VOOM wasn't viable as a programming suite. I believe that it wasn't so much that DISH "lost" VOOM as Rainbow failed to keep it going.Lost All Over disputes.
Like Smithsonian, if the provider fails to provide significant new content, what's the point of keeping a channel around? 100-150 hours of new content per year? Really??? That works out to just over 4-6 days per year.