New York has, and has had since the dawn of the medium, a thriving television industry. There aren't as many shows coming out of the East coast, but there certainly are a number of them, and they're not just shot here.
There are film prodcos here too, even if some are offices of.
I agree LA is the center of moviemaking, and there's more tv there, but there's certainly tv in NY, and in Tor. There are also some premier programs, mostly MFAs, mostly at schools in the areas -- UCLA, NYU, Columbia, etc. I wouldn't think creative writing programs, especially at undergrad, would have too much in the way of pro screenwriting knowledge to impart or work to do. That said, an MFA isn't required. There are good classes to take -- again, usually in the centers -- at writing centers, but check out who the teachers are, if you're unsure of what you're doing, but lots of people don't have degrees or classes, they read and polish and find people to help critique.
The advice about networking is something I'd pay heed to. If you want to work in film, find your way to film sets, which exist in NY, LA, Tor, Van; if you want TV, try for one of the internships.