Well, considering much of our technology was designed to think for us, I think this is a valid argument! Forget about the incredible modern technology we are blessed with today, ... let's go back even further to another "modern" little gadget: the calculator. By design, the calculator is designed to do simple mathematics for us, automatically decreasing our ability to think for ourselves if we use that little gadget.
However, as with everything else, there is another side to this argument. Technology, the internet for example, can also present us with new ideas that we would never have thought of previously, thereby helping us learn MORE. It's not longer hard to look up these previously unknown theories. They are, literally, a click away! A good thing!
So, in short, everything in moderation. Let's just not live up to the horrors of Disney's Wall-E, okay?