Quotes from Travis Day in an official thread:

I have a love hate relationship with Wrath and Archon for that matter. This is a topic that I felt I should at least comment on since it's come up on many occasions. There is no fundamental flaw with having a 2 minute cooldown ability that transforms your character and is really powerful, the problem is when it becomes a forgone conclusion that these AWESOME abilities are up 100% of the time and instead of being excited that they are up you are annoyed when they fall off. We have talked about what if anything we want to do with these abilities in the long term. I will say we have no short term plans to change them but we don't like that they aren't fulfilling their original purpose which is to provide a really awesome button that mixes up the tempo of combat for a small window of time.

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I want to make this point clear. Wrath is an awesome ability, when the game first launched players used it the way it was designed to be used which was as a huge, temporary, power boost to kill a hard champ or fight a boss. The problem stems from the ability to keep it up 100% of the time. Any future change that we would consider making to either this or Archon would be focused on making these not a 100% uptime abilities. So yes as was stated above Wrath isn't the problem, Thrive on Chaos and the assist duration extending mechanic of Archon are the problems.

I don't think I can blame them here for lack of foresight. Inferno was a dramatically different experience on release and it was rare, if not impossible, to play the constant WotB ToC builds. Enemies were simply too powerful where nearly every class had trouble with 2-hit KOs. Echoing Furies weren't nearly as commonplace and iirc, Blizzard actually buffed Whirlwind in a later patch,. They did what they could when they nerfed the tornadoes proc rate, but equipment just became too powerful even for that.

It sounds like they might consider doing something about it very long-term, but they're probably mostly resigned to its existence.

I wonder what the game would be like if Thrive on Chaos had simply been a 10-second extension. The Spin2Win build has had a heavy influence on the game's development from fairly early on and single-handedly blew away the novelty of Paragon 100. What would happen if they had somehow eliminated CM/WW Wizards from the game as well? MP10 would be entirely off-limits except for the godly geared and who knows what other Barb builds people would have been created?

Like I said, I can't blame the devs for that one and they tried to fix the error without killing the build entirely. I think the devs are about as disappointed as I am on how Spin2Win has impacted the game.