Before you dive into coding, consider setting up a landing page explaining your idea. Use tools like Unbounce or Instapage. Drive some traffic there from Google or Facebook ads and see if people sign up or show interest.
G4 was way before its time if you ask me. Cable networks were seriously sleeping on the gamer demographic, and G4 proved there was a huge market for that content. Too bad the execs didn't catch up to what was happening online, could've moved to streaming platforms and crushed it …