I love the idea, and I'm sure we all thought the same thing the moment we learned about this project. Unfortunately, as Dagobert said, there is simply not enough space in the current hub. But when they finally move the Tram Tour entrance, dig a tunnel or build a bridge for it and expand Hollywood Boulevard... Then it would be really great.
I do like the idea of a streetcar going through Studio 1, though, and it made me realize how nice it would be if Studio 1 had a more open entrance rather than the department store-style doors there are now. Bring it on...