Okay... I may sound like a technophobe, but I would rather not have electronics implanted in my body. And I would be glad to see a way to be rid of wireless; while wires are cumbersome, I would think that a good design can take care of that (wires inside clothing, or something) without exposing human to electromagnetic fields. Like, optical cables, anyone?

As wireless industry expands, tin hats, foil pouches and copper tails may actually become a fashion reality ;-) Well, electromagnetic-field-isolating wallets already are...

When speaking of wearables, I am actually thinking of Stanhope ring. Compact and private display, and can be part of a "net" of gadgets, such as bracelet for measuring blood pressure (even blood oxygen and glucose levels, too, if these green, yellow, red, near-IR, IR diodes finally will be able to provide accurate enough measurements of what is happening).

If you do not need privacy, but want to keep seeing ambient environment, then forward image to glass-display, yes (semi-transparent glasses-displays should become fairly popular in the sunny places where people wear sunglasses regularly). Unfortunately, eye-focus distance makes it difficult to make not-bulky see-through electronic display-glasses.

Given how easy it is for a human to pinch their nose, electronic glasses should definitely have buttons somewhere here.

Bone conduction microphone and speakers are interesting, as well as "third eye" camera at forehead (I would say it is a more intuitive place to mount it than above the bicycle helmet).

Why do they put Bluetooth everywhere? Surely, wires are less power-hungry?

Thank you. Best wishes.