Why ? The only old TV shows I see being popular long term is era defining shows you watch for nostalgia (eg. Seinfeld, Friends). Maybe some real classics like Sopranos that everyone was watching at the time.
Shows like Mad Men ? I really don't see it. And more importantly this LOTR show - how many people are even watching Game of Thrones now and how much interest will it generate in the future ? Unless this LOTR show is somehow groundbreaking with visuals (and it's a lot harder to do now then back when they did the films because the bar was so low back then) - I doubt it's a valuable long term play.