I tend to think it will. Tools replaced our ancestor's ability to make things by hand. Transportation / elevators reduced the average fitness level to walk long distances or climb stairs. Pocket calculators made the general population less able to do complex math. Spelling/grammar checks have reduced knowing how to spell or form complete proper sentences. Keyboards and email are making handwriting a passing skill. Video is reducing our need / desire to read or absorb long form content.
The highest percentage of humans will take the easiest path provided. And while most of the above we just consider improvements to daily life, efficiencies, it has also fundamentally changed on average what we are capable of and what skills we learn (especially during formative years). If I dropped most of us here into a pre-technology wilderness we'd be dead in short order.
However, most of the above, it can be argued, are just tools that don't impact our actual thought processes; thinking remained our skill. Now the tools are starting to "think", or at least appear like they do on a level indistinguishable to the average person. If the box in my hand can tell me what 4367 x 2231 is and the capital of Guam, why then wouldn't I rely on it when it starts writing up full content for me? Because the average human adapts to the lowest required skill set I do worry that providing a device in our hands that "thinks" is going to reduce our learned ability to rationally process and check what it puts out, just like I've lost the ability to check if my calculator is lying to me. And not to get all dystopian here... but what if then, what that tool is telling me is true, is, for whatever reason, not.
(and yes, I ran this through a spell checker because I'm a part of the problem above... and it found words I thought I could still spell, and I'm 55)