The .TV relaunch was not very successful because the premium domain name prices are yearly recurring fees (which may increase beyond that price buy some unknown amount).
People who would create great content and later stumble into a business model are not likely to do so on a premium .tv name…which means most of those domain names won’t have high quality content on them. Those that do may see thin profit margins because they have no control over their domain names…as they make them more valuable the registrar can increase prices without mercy, and when the registrant can no longer afford the domain names the registry gets to keep or sell any brand value the registrant built up.