That’s absolutely a part of the bigger picture. For several reasons, I believe autonomous cars will hasten the transition to EVs.
One of the things I’m struggling with is — what the heck kind of garage door do you build for these cars? You mention climate control, but it’s not okay to have a hole in the side of a building 8 feet wide. If the traffic volume is low, a typical-looking garage door may suffice. For a little better isolation, a series of 2 doors might be preferred (just as we commonly have for the main doors in buildings). It’s also not practical to duplicate these doors on every floor, so the entire spiral would need to be either fully inside or outside with the garage door on the ground level. I think the ramps would exist in an in-between space slightly muddier and slightly less hospitable than the office space itself, although nowhere near what outside is.
There may be mitigation methods for ice/slush, not to fully remove it, but reduce the volume that is brought in. The cars, themselves, could be programmed to participate in the process… some high-tech equivalent of wiping their feet.