I have a phone and a smartwatch on right now. I could also see some kind of mini-wearable like a pendant or bracelet or cufflink that could change colors for priority notifications or other user defined events. Heck, I could see something built, tastefully, into the frames of my glasses as well.

As long as its convenient, useful, and easy to use, people will be on board.

As a side note, I stopped wearing my Moto 360 for a week due to being too lazy to unpack my charger from a recent trip. I was driven half-crazy by having to pull out my phone all the time for basic notifications or to check the time. Once people get a taste of wearables they'll love them.

Further, that smartphone has nearly a billion transistors. By that metric, we will see wearable electronics grow geometrically.

Humans and large livestock (and maybe even pets) will have health monitoring devices embedded into their bodies in the near future. The devices will save the insurance companies money. Savings on insurance premiums will be the incentive to encourage mass adoption by citizens and owners of livestock.

Humans, ie. large livestock, will have monitoring embedded into their bodies in the near future -- not just for health reasons.

If we can think of it, governments can push it as a formal requirement -- one step at a time.