Oh, I'm not denying the reason they are cleaning up that area is so they can use it as a swift bypass route from the hub to Town Square. That part is very obvious, and if that really is their only goal, then they have succeeded.
What I am really saying though, is that they dropped the ball on this one. They needed more than just a swift exit route after Wishes. They need a permanent arcade open at all times so they can use that as a permanent show ready corridor for guests to move around in during parades, bad weather, and maybe just if they want to stay out of the sun and in AC. And that arcade should have entrances to the shops and things, and have access to Center Street.
It's simply a matter of them building something that was cheaper and more limited in use than what was actually needed.