If this were to be a hardware pursuit, you'd have to buy a bunch of sensors, all which have a price tag and their own limitations and issues. This might bring in $$, but also cause a lot of frustration that users would not find intriguing. Or, the sensors could be in the camera which would cause even more problems with power, heat, etc and the price tag.
Software, which can read data from a variety of sources such as GoPro, GPS, thermometer, whatever, and then integrate it all into a video timeline would be more practical. Then let the user overlay data onto the video using a variety of free and paid visual effects and templates.
GoPro should be working on a competitor to VIRBedit for this purpose. VIRBedit is great and doesn't require a Garmin VIRB cam etc. There is also http://www.traceup.com/ for snowboarding and surfing.
GoPro really missed an opportunity here, but it may not be too late.