Yeah, I don't think the distance itself is a problem.
The real issue is that there's nothing between them. You'd be looking at parking and backstage and an unthemed warehouse building (the former Starcruiser) with no bathrooms, snacks, etc. on the way. They'd have to spend a lot of additional money on filling that in with theming etc.
It's basically the same problem with having a walking path to Rafiki's at DAK, although that one is longer and has less of a theme problem since it's mostly woods. Still lacking in bathrooms etc. though.