Well, language is a subject to 'fashion' one-upmanship game: people want to demonstrate their sophistication, often by copying some "cool" patterns, but then over-used patterns become "uncool" cliche.

So it might be just a natural reaction to over-use of a particular pattern. This kind of stuff have been driving language evolution for millennia. Besides that, pompous style is often used in 'copy' (slogans and ads) which is something most people don't like.