This is what my question too.zee have latest films but not old films like k tv and raj digital plus.they need atleast 1000 films rights to start a movie hannel.
I think they do have some Biggies in their hands already. Considering the frequent movie premieres on channel I feel there are around 200 -250 movie titles in their bucket. As you said, they'll add tamil dubbed telugu, hindi & English movies. They must've been in process to acquire old movies.
Combining this all it's enough for them to survive..