As one that plays a few sports, the frequency and generally the forcefulness that I am hitting my head biking versus something like hockey simply doesn't make the system make any sense to me. Maybe if you are racing and going down a lot it could provide more benefit, I just don't see it making that much difference the one odd time over the course of years that I may fall and hit my head.

I'd rather see something like that in my hockey helmet, where I am at risk of taking multiple hits a game to the head even in a pickup game.