I expect it's going to end up being to guide dogs what Craptions are to STTR. Which is to say, a lot less hassle and a valuable tool when used appropriately, but no substitute for the real thing. We need to be wary that it doesn't lead to assistance dog users being refused access (or funding) because they should just "get an app".
Once the sensors become a mainstream thing, I expect they'll appear in all sorts of form factors for toys and robotics applications. Something hand-held to augment or substitute for a cane seems like an obvious application. Maybe augmented reality glasses will finally happen? No doubt the Mega-Global Fruit Corporation of Cupertino, USAnia will come up with a compelling reason for your watch to have lidar, too...
Some years ago, on a foggy night ride, I had a conversation with TimO where we decided that a lidar-based pothole-highlighting device would be a useful cycling accessory. I think I'd just performed an emergency swerve to avoid what transpired to be a harmless change in the colour of the tarmac, thinking it was a kerb. I could imagine that sort of thing being invaluable to people with low vision.
Wonder if cheap lidar sensors will make a difference to autonomous vehicle development? If nothing else, it would be safer than trying to do it all with vision alone.