Doing what? Releasing a new line of core books in 2024?This is not just about adventures (unless you're WotC, apparently).
I asked earlier if there was a reason they're doing it this way that doesn't revolve around making more money. So far, the answer still appears to be "no".
I'm sure an uptick of book sales is definitely a factor in their decision. They're a business after all. It's also the game's 50th anniversary so clearly they were going to do something so the timing is good. If 5e wasn't selling well, I'm sure an actual 6e for the anniversary would have been a consideration but since 5e is selling well by all accounts, 10 years in is a good point to launch a refresh line of books to clean up some of the rules, rebalance some of the classes, take a different approach on how the material is presented (DMG I'm looking at you..), and give new players a clean point to jump on.
In other words, the things they've been saying if you actually take the time to listen.