So what you're saying about the sidewalk from all stars to Coronado is that if there is enough demand (foot traffic) and it's logistically feasible Disney will build a sidewalk. Which means OP's idea will never happen. Maybe they will get a gondola
I view pedestrian and bike friendly roads as a quality of life issue. I'm personally more at ease when I don't feel totally dependent on motor vehicles. It would be nice but I realize it's impractical for Disney. The cost benefit analysis does not favor a project like this.