What hills? The 407 Transitway like any other fully grade separated mode of transit has distinct stations that you will need to access via elevators. The stations are mostly flat with access needing to be done via elevators. That's not really any different from your typical Subway/new build GO station, or heck even some of our existing bus terminals like Hwy 407 Terminal.
I am so confused, what are you arguing for/against? We're talking about how the 407 transitway in the context of replacing the existing frequent 407 routes like the 40 and 47, not local on street bus routes, and you came in arguing that the 407 transitway will be worse than the status quo of this for the rider:
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I don't know why you're bringing up BRTs and LRTs at all - they have nothing to do with the topic at hand