Yep. They were lucky enough to have an incredible cast of talent back then. Stone Cold was absolutely an important part of those ratings, but it was also important that when he dropped out there were others that could easily carry the weight.
Regarding the ratings: I fall perfectly into that 18-34 bracket that's in heavy decline (assuming those figures are still semi-accurate today), and it's because there's no option to stream RAW and Smackdown. If they were added to the WWE Network, even with a 24 hour delay over live broadcasts, I'd watch them. But no way I'm paying for a Sky TV package over here just for WWE. Over-priced as hell, and their continued reliance on cable TV when it's been dying a slow death for over a decade now is the biggest reason for their audience loss imo.
Actually, what we found out is that aside from The Rock, the other people couldn't carry the weight. Because after The Rock went to the movies and Austin turned heel, the bottom fell out of things.
Because truthfully, Mick Foley, Triple H, Kurt Angle, and yes, even The Undertaker in 2001 were B+ players. Which isn't an insult to them. You need B+ players on the roster. After all, in the modern WWE, you have a bunch of A+ players, then a bunch of C+ players at best with no middle ground.
But, you need that A+ guy to truly draw. Cena helped, but he was an A-level guy in a world with no A+ guys (and no, Bryan, Punk, etc. were not A+ guys. People were talking about Steve Austin being Flair's heir apparent in 199freakin'1. He was not some random guy Vince plucked out of nowhere).
Well that as well but when exactly did she first show up in NXT?
Asuka showed up in September of 2015 in NXT. 1st match was at the Takeover even around then.