Yet, here we are, 18 years later, SpaceX has perfected reusable rocket boosters that can land themselves, they've sent astronauts to the ISS, they own most of the satellite launch market, and they're now working on a fully reusable rocket. The second thing you should know about ideas and innovation is that the world is always changing. It's easy to come up with 1000 reasons why some idea might fail, but you'll never know if you don't give it a proper shot, and the best way to learn is by doing.