From the article: it’s heartbreaking to find out someone stole your bike; bikers love their bikes

Sounds like your idea addresses a real need. I wonder why I haven't heard about this kind of thing already implemented?

Price maybe? http://www.gizmag.com/spybike-gps-tracker/22999/ says $153.58 plus a pay-as-you-go SIM card.

Also http://www.zoombak.com/products/service-plans/

I wonder what it would take to make it more economical.