Sorry but it sounds utterly pants and a waste or resources adding in a whole load of other features to try to justify it. I would prefer they spent that dev time on making getting out of your seat a much better experience.
Basically,I just don't see the need in it.
Oh, I quite agree that spacelegs don't really belong in the game, or at very least not as any near or mid term goal. If they want to look into them 6-7 years from now, I'd probably be more okay with it, but I feel that there's so much that needs to be done in the game at the moment to worry about creating a spinoff.
However, making EliteFeet a complete spinoff would be a great way of raising the funds and encouraging actual content for it. If they can sell it as a standalone expansion for ED, then it will be worth their time as they can then charge full-game prices as long as they offer full-game content. Trying to release EliteFeet as a little walk around station/ship minigame to add an extra timesink to the game as a DLC would be an insult to us as players, a waste of a concept as well as an overall waste of Dev resources (doing first person stuff would basically require the creation of an entirely new game in terms of physics and asses, even for basic movement around stations).