You are right, WebTV was very high tech in 1996 - 97. Thats why M$ bought it and used the chip technology to create the Xbox.
I don't think you will ever see any new TV based systems like WebTV. TV is obsolete. Computers have killed TV. Now days people watch TV programs on their computers, tablets and smart phones. No one want to have internet on their TV, except maybe gamers. I haven't even owned a TV in over ten years, and have no use for one.