Fespite the numerous nitpicks NBC had with The Cage, they made the extraordinary and extremely rare move to order a second pilot. That doesn't happen with failed pilots. If a pilot fails then that's the end of that. There's NO second pilot and NO subsequent series.
Agreed. In Star Trek's case, it was the belief that Herb Solow, Lucille Ball and Gene Roddenberry had that got the second pilot. The main players, realistically, were Solow and Ball, because they knew how to navigate a conference room and a business meeting. They knew the strings to pull and how to not accept no for an answer.
If it went to a network from any other studio, the only thing we'd have now would be "The Cage", a curious footnote and a "what if?" from television history. Liken it to The Beatles having Brian Epstein persisting and George Martin producing. Any part of the equation missing and nothing happens.