Easy potshot is all the generative AI. We get to write code and emails and homework and books faster. We also get more malware; and, when the realms of text, video, and voice are all convincing enough, we get that deepfake flood we're promised is coming, and so the breaking of a "shared reality" that snowballed with social media echo chambers becomes fully realized. So far the only "solution" I've seen is AI detection software. To me that sounds like a continuation of the same old cold war except it exhausts even more mental resources.
If you want a more novel guess, anything of the brain-computer interface ilk. It gets accurate and portable enough and it will get put into as many hard surfaces as Big Tech can stuff it, from trackpads to phone screens to more "public" terminals like ticket counters or automated fast-food restaurant booths. It starts with the novelty of generating Stable Diffusion images with just your brain, or streamlining navigation menus with thought. And then, just like big data fueled AI and proved very economically lucrative, every single thought anyone ever has will be stored just because we have the capability. FAANGs and the NSA have many redundant data centers. Every thought you have can be monetized. Or used to convict you of thoughtcrime. I can't really see the fabric of society withstanding that kind of floodgate.