This guy sounds like the kind of twat who joins our company, bitches about how badly everything's been written, then leaves behind a load of shitty unmaintainable code that's "really clever". And somehow he's in charge at Twitter? Christ.

Very true but as the econmoist points out it may be a long drawn out battle.
I believe the example of Honeywell and GE used by another poster was an instance where preventative action was taken before the merger was consumated, whereas what we are talking about here is breaking up something which already exists (referring here to the established windows product rather than breaking up MS which doesn't appear in the articles list of remedies considered).