I'm assuming that it's some middle manager with a little bit of power (we've all experienced that guy, right?) and he's managed to completely break the main product of the company.. But.. "it's OK because I know better! And the users will come around when they see my genius.."
No. Andy! (or whatever your name is, but it's probably Andy) you've just broken the big, cash cow product of the company and alienated a lot of users who are very passionate about the product and are now very vocal about that.
And ultimately it doesn't matter what "the suits" do now, your "passionate and newly vocal users" are looking at alternative solutions at competing companies that produce a great product and they don't have an "Andy" working for them. (well hopefully they don't have an Andy)