#2. NXT becoming the third brand
NXT shocked the world last year by becoming WWE's third major brand and announced that they would be airing episodes on The USA Network. Of course some of it had to do with the Wednesday Night War that would ensue between WWE and AEW, but this was also the company's big chance to make a third brand work again.
And they actually made it work! Just look at how NXT did during the WWE Survivor Series PPV last year, and you can see the company had some stock in that brand. Beyond that, the fact that NXT dominated Raw and SmackDown by several points was all the proof in the world that the company was trying to get the brand over.
In the end, this just would not have been possible five years ago . Not only due to the fact that the brand didn't have many established names at the time, but also due to USA Network not in need of more content from the company either. If nothing else, it was a perfect marriage of convenience and was a huge stepping stone for NXT.