Now-a-days, you are either popping a can top or hacking your way through a waxed seal. Bottle caps are just not part of the current craft beer scenario.
Which leads to the switchblade without a blade but a bottle opener instead. The customization is cool but I do not need to carry one more thing around that I would probably not use. And more than likely, I would forget the one time it could be used.
So, not needed though a good idea.