Didn't forget. Purposely failed to mention. Sure, it was a memorable moment. But what happened to the storyline afterwards? Austin's heel run fell flat. He says it himself, if he could have a do over, he would have stunned Vince and left Mania as a face.
And for NegativeFeedback...
These are different situations. I can't say much about WrestleMania IV. As far as I'm concerned, that looks pretty good to me the way it is in the history books. As for the others, they're peculiar situations. Neither story was carried out perfectly, but they were what they were. Maybe Orton should have won the WWE Title at 25, and that may have worked. Just switch out the main event. As far as The Miz goes, yeah they flubbed his title swap too. But what is there to expect from that match. It didn't happen because it needed to happen. All that match did was serve as a stepping stone for the Rock to return. But that's a different story.
I heard opposite with Austin at the time.
He embraced playing a heel, as it added new depth to his character. If he didn't like it, he would have walked out. If he didn't like it, he wouldn't have played it to the hilt.
SCSA found a new lease of life as a heel. It added to his character, and gave him something different to do, and new opponents to fight. He had done it all as a face, and Austin going to the "dark side" opened a world of possibilities. Too bad they didn't explore them all, but I think it added years to his character, which was starting to get stale.
In fact, Austin only walked out only AFTER he turned face again. At the time, there was the word around that Austin didn't want to go face less than a year after his heel turn, and felt that his reasons for going face didn't make sense (why couldn't he still be a heel, even after the Alliance storyline was over).
The main reason Austin went face again was that the fans still cheered Austin, and the freshness of his character made him hot to the fans again, so WWE rush-turned him face, with little reason.
A lot of people didn't like Austin going heel, but at Wrestlemania, against the Rock, it meant something. It needed to happen, and Austin was ripe for change.
In fact, maybe WWE should have used this as a template for Cena- have Cena turn heel on the Rock at Wrestlemania. Maybe the fact that the Rock is less popular now, and the WWE's false belief that it hurts their merchandise sales (despite the fact that Austin merchandise still sold when he was heel) means that Cena has gotten stale, rather than refresh him with a much-needed heel turn.