Well, that's not true. The two key advances of indoor farming are preventing water waste and being able exponentially increase farmable area, by stacking levels

Well, that's not true. The two key advances of indoor farming are preventing water waste and being able exponentially increase farmable area, by stacking levels. Those two advances will get cheaper and easier for the forseeable future - meanwhile fresh water and farmable land gets scarcer and thus more expensive. The cost of each option will definitely approach parity long before "always" is over.