This sounds fun ;-)
Totally serious here, this is one of my favorite features from StreetPass expanded.
I just hope you can send Miis from Wii U and 3DS, though. I'm not feeling like doing a third Mii based on me.
It's a cool idea, but even though it's limited to friends I'm starting to picture the news stations. "NEW NINTENDO GAME SHARES PERSONAL INFORMATION TO STRANGERS" and then making the assumption that it's somehow connected to a cartel network or something.
The limited to friends thing means it's potential is already greatly reduced.
If it were to open me up to local persons with things in common with me? Then yeah, that'd be something. But if I'm friends with someone, I doubt I'm not gonna know these sort of things about them already...