Probably the future of wearables is the personal hub.
The problem with wearables is that a radio capable of sustaining a connection to the outside world - be it 4g or wifi - needs a fair bit of power and consequently quite a lot of battery. So devices have to be fairly chunky, or else have to be recharged more often than you'd like. But your bluetooth mouse probably goes months on one charge - mine certainly does. So the solutions is to have a device mounted discreetly on your belt or in your handbag, or carried in a pocket, which just acts as a personal hub/firewall, doing backhaul for your wearables. It doesn't need a screen. It doesn't need apps. But once it's paired with your wearables, you can use a device which has no backhaul capability to make phone calls or to access any service on the Internet.
This is an extension of how Google Glass or your Pebble watch already uses your smartphone. The smartphone acts as a personal hub. But if the display you actually use is the one on your Glass or the one on your Pebble, you don't need the big, fragile, power-hungry screen on your smartphone any more; so the personal hub can be cheaper and much more durable than any smartphone.
Once you've got that concept, there are other services that a personal hub can supply to your wearables, for example storage.