No, the idea behind it is not moving them, whereas evacuating in place. If there was an elevated walkway, like a bridge, than there could be a one-way hatch below, at which firefighters could simply pull down, creating a retractable, but short, staircase to allow guests to walk off, onto this long, bridge-like structure that runs directly underneath the gondolas, without requiring guests to stay in the cabin in the event of an issue. I know it's a crappy idea, but who knows?
Edit: It's essentially a really long, elevated crosswalk like this, except obviously with an open roof and a lot longer:
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