My guess is sometime this century we will come up with the physics that will allow a small portable power source capable of providing enough energy that engineering will come up with man-portable electro-mechanical devices that will allow for some nearly unimanable conveniences. Robotics also will advance sufficiently that some form of 'intelligent' mechanical conveyance with the footprint of a pet instead of a car will become as commonplace as a PDA is today.
Imagine having a hovering box follow you around all day, untethered, capable of stowing perhaps 50 kilos of misc goods; able to go anywhere you are able to go, and providing you with a host of communications and security functions, including PLB functionality and the ability to diagnose distress even if you become incapacitated.
Pretty cool, huh?
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)