Something like that is never going to fly. What if I meet somebody who doesn't have an enabled phone? I'll still need to carry around the business card. So why put in the extra effort for other systems?

For the first time I see a benefit in putting a QR code on my card, though - maybe the "enabled" people could just scan the QR code and would not need to bother with taking the card.

I thought QR codes would be superfluous because of OCR, but apparently the technology is still not there yet?