There's too much financial incentive to spread disinformation, if you can make money by posting on social media and attracting a following on your disinformation there's always going to be someone ignorant/innocent enough to fall for it.

I can't see what else humanity would need to develop as defenses, we can access nearly all information that exists, almost instantly, from the convenience of almost anywhere. The problem is to knowing how to parse so much information, even more when there's conflicting information where nuance and critical thinking are required.

Accepting that there's very few absolute right answers, that the real world is much more "depends" than "for certain", and stil being able to navigate it all to reach a conclusion that aligns with the best probable answer demands quite a lot more quality education than the vast majority of humanity has access to.