I doubt this will do much - people have found out that you can download whatever tv show you want online, why should they pay for it on iTunes?
It might have a very, very small chance of working in the US, but outside its borders it faces an even bigger problem: most tv shows that can be seen here are several seasons behind, how can Apple compete with that handicap against free downloads for anything other than the "I am too scared of computers to even go near them crowd?"