Apart from the commercial model that these will use (what they'll cost to make use of, etc.), the thing I'm wondering about is how visible they'll be at sunrise/sunset.
Google is saying that they'll be barely visible to the naked eye, but just after sunset/before sunrise, they will be illuminated by the sun when the rest of the earth is still dark, which should make them more visible than they would be during daylight hours. In my mind, I'm imaging a dark sky that's full of little orange dots. I have no idea whether or not it would happen like this though.
Google is saying that they'll be barely visible to the naked eye, but just after sunset/before sunrise, they will be illuminated by the sun when the rest of the earth is still dark, which should make them more visible than they would be during daylight hours. In my mind, I'm imaging a dark sky that's full of little orange dots. I have no idea whether or not it would happen like this though.