It occurs to me that, absent government meddling, I would fully expect such technology to become ubiquitous in a free market, such a market providing the best possible environment to allow the evolutionary perfection of such a product.
Of course, "perfected" implies high reliability, and I also think a great degree of choice and flexibility are important. For instance, should the device fail (run out of battery power or something), into what mode should the weapon failsafe? This answer is going to depend greatly on the weapon's intended application, as well as its user's preference. For instance, a weapon intended for self-defense should probably fail into a fireable state, and a range toy should probably fail into a "safe" state.
Imagine, for the sake of argument, that such technology existed in some form which was highly reliable, and in the rare cases where it did not function, it would render the weapon fireable. (I do doubt that fingerprints would be the likely mechanism for such highly-reliable and necessarily fast biometric identification, but the exact technology is irrelevant.)
Given the above, and no reason to fear that such a device could be "used against" its owner by prompting legislative mandates, I suspect the great majority of carriers (especially open carriers) would avail themselves of such firearms. Really, what's not to like?
Now, this isn't some switchback approach to a defense of such mandates. It's more a lamentation that there are indeed folks who so poorly understand the nature of power and incentives that they would endanger such a future by proposing mandates at all, which in failing to manifest serve only to chill market demand for such technology, and should they manifest could be fully expected to induce lack of competition, complacency, and ultimately technological stagnation.