There is a big incentive for this future as it will be the high point of advertisement. Every AI search, every AI written book, every AI produced TV show will have the incentive to sell you something. Without other sources of information people critical thinking will be impossible, anything that the AI generated content says is true. We can avoid this future, but I do not see any of the big companies caring about it, if anything they are salivating on future profits.
Your brain will not be empty but full of whatever the highest bidder wants you to believe.