If there was an AI model that ran locally on a PC for basic things and cloud sourced computer power for more complex tasks, all of these data centers would become obsolete in an instant. All of the invested capital and materials wasted in a flash.
Edit: lots of great counter points in the comments.
There are already AIs you can run on your computer or even your cell phone, they are just really really specialized or dumb.
Even if you could magically network every desktop, laptop, workstation and cell phone in the world and run them all full power 24 hours a day doing nothing but powering this network, you are probably an order of magnitude or more behind even current data center capacity.