I think the 'killer app' is missing here. If it was stand-alone tech, as a platform for something cool I would be considering inputs and outputs (HCI).<p>Personally I would be looking for a small microchip that could be charged externally and is able to interact with other devices. Potential applications:<p>* Some form of key storage where computation can be performed. Not just credit cards, passwords, but something more versatile and expandable.<p>* Connection to devices or hardware for personalisation, i.e. you could indicate to any car you drive your personal preferences, or where to query them. More day-to-day for tech people would be using a colleague's computer and having your mouse sensitivity preferences transferred, editor shortcuts available, etc.<p>* Constant health monitoring (movement, glucose, VO2, etc). We can get these things from watches and patches, but we ultimately have to take them off at some point to charge and to let our skin breath.<p>Ultimately, for most people the question that needs to be answered is "why would I, an otherwise healthy person, have a surgery with non-zero risk, to insert X? Why would I not just use X device?".<p>Some kind of low-risk and non-evasive interface to the brain would be a game changer. Some kind of interface to intended muscle actions could be big too, not just for the disabled but for exoskeleton functionality. I can definitely see an exoskeleton (of some kind) help older people remain more mobile (and economically productive) for longer. Normal jobs would have less wear and tear on the body (i.e. building trade, etc).