Every company I've worked at will ship version 1 to production and proceed to build on top of version 1 forever. Of course, by version 1 I mean "the proof of concept I showed someone else".
It's the classic bait-and-switch of corporate development. They get you in the door by pretending they have a rational process, and wait until you're invested before dropping the facade.
I, too, have never worked for a company that ever considered retiring software ahead of immediate necessity. Generally, it's always "we don't have time to do it right in the first place, because we're too busy fixing all the stuff that is broken right now."