It's possible, but it might be more difficult than other changes since they'd have to lock the camera yaw and pitch values. I suspect it to be possible since they change the UI around so dramatically for Street View in GE.

Personally, I do think they will get to it eventually because it's a nice tool. If they do plan on it, I would also imagine it's not a high priority since we can use Google Maps to view it. I just hope they leave the mouse wheel to do a proper zoom and not mess it up like they did with the Street View UI.

I'd probably keep doing this even after that, though. I don't think their interface will highlight where to find the imagery from a high altitude. I would imagine when it comes, there will be a new icon that becomes active if you're zoomed in and move over an area with 45 degree imagery.