This is my fear too.

People will say "oh, it's the same as when the printing press came, people were afraid we'd get lazy from not copying text by hand", or any of a myriad of other innovations that made our lives easier. I think this time it's different though, because we're talking about offloading the very essence of humanity – thinking. Sure, getting too lazy to walk after cars became widespread was detrimental to our health, but if we get too lazy to think, what are we?