Low priority
Return on investment
Usefulness (besides being "kinda cool")
Just to list 3. I see where you are coming from, but if you are at work without access to sod, sure you can check and see if a friend is online, and if they are you can say "Hey, soandso is online" and if they aren't, you can say "Oh, soandso isn't online". You wont be able to log in and do anything about it, since as stated, you don't have access to log in. If you are trying to buy something, or waiting on a raid, you'll have to log in anyways to either join or make your purchase.. so again.. I just don't see where this is useful, which makes it a really low priority, since it offers no functionality besides "Hey neat".
I'm not in a position to say no, im simply offering my personal viewpoints on it. Really if it's something that would truly benefit the community, it has to do something more than be "kinda cool".