Hmmm...this isn't exactly how I remember it. There was a sitshtorm from the beginning, and not just the "Its not my D&D" or Slaviscekian PR debacles. Discerning gamers were having issues with the rules from the beginning, particularly the Grind and having to mess with damage and attacks and all that. The problems were evident right away. I think what became clear later on is that WotC wasn't able to fix it, despite giving it a kind of half-hearted shot (Essentials).
I agree with the comment regarding the storm. I know that a lot of people found serious problems from the beginning and I'll agree that fans saw some issues. But there was massive fanfare about the overwhelming success of the NYT bestselling game and much celebration in the face of data that 4E was the king of RPGs. There was much proclamation that hold-outs would give in to the inevitable, that Pazio were fools, etc, etc.... The fan side was overwhelmingly supportive, even if they agreed in some issue (grind) which they considered well worth the trade. (And, to be clear, good for them!!)
Remember, Essentials was planned like a year after launch, so WotC knew there was a problem.
Well, again, it depends on who you asked. There was certainly more than a little "I told you so" from the h4ter side. But the pro-4E side was still staunch. They claimed that critical comments were just proof of desperation. Remember, it was all about getting that red box on the WalMart shelf. Everything from there would be destiny.
Don't forget that many people had the rules before they were published by virtue of PDF Gate (remember the core rulebook PDFs with the little rainbow code bar? Not that
I owned such a despicable, illegal download but "I just heard about it"

).
Right. Good thing that hasn't happened this time.......
Seriously, I don't strongly disagree with the over-arching point you are making. The foundation for disaster was there. But at the same time there was enough new shiny and endorphins that the atmosphere amongst fans was through the roof. And they were wrong.
So, just because 5E fans (including me this time, though I'm not a full superfan) are feeling the same way this time doesn't mean things will be any better 3 years from now.
I still think a hell of a lot is riding on how hackable the game is without losing itself combined with how much WotC can get the fanbase to embrace a customizable RPG.