It could become reality, IF most weight parts will be done in space from space materials. Or if use some not existent now very cheap system to deliver payloads

It could become reality, IF most weight parts will be done in space from space materials. Or if use some not existent now very cheap system to deliver payloads, like catapults or centrifugal accelerators. If make all at Earth and deliver by rockets, economy will be somewhere like build solar power station in Antarctica.