We’ve estimated the math here before. It would be more financially responsible to helicopter people across than build/maintain a bridge with even the most ambitious usage. And not even bothering with the realities of hot summers and cold winters which would impact usage.

The ramps alone you’d need to get to that height and be walkable/bikeable would be absolutely massive and consume multiple blocks on each side. And no, you couldn’t rely on just elevators as you’d have security/safety/maintenance issues.

The scale is just insane.