No it doesn't. All it proves is that Blizzard might respond and make changes based on popular demand. It certainly does not prove that whining and complaining are necessary or even have value.
Don't get me wrong, I certainly believe in constructive feedback, just saying that whining and complaining aren't a necessity thereof.
Well whether or not it was dumb and pointless is debatable. I've certainly seen no consensus either way. What is evident is that a significant number of players think it was a big deal. To me personally it just felt like a big fuss over nothing of consequence. And I guess Blizzard agreed, hence why they had no real reason to fight it.