Is tech going to render humans useless?

This TechCrunch article is what I'm most afraid of... Technology overtaking us in the job market, rendering us to become nothing more than batteries to feed the grid to power robots.

Almost every job, in every field, probably including yours, will increasingly be threatened by obsolescence and/or automation. That’s a simple and inevitable corollary of software eating the world and the concomitant increasing rate of change. As that rate accelerates, technology will soon start destroying jobs faster than it creates them…if it isn’t already.

I guess eventually when we can no longer power the grid, we would be hunted for game and then terminated for fun. Rise of the machines seem inevitable... But luckily there is still chance the Vulcans may still visit us and save us all.