"Corporatism" is a new word to me, so I'm inclined to agree that it's probably not a good idea to push for its use.

On the other hand, there are some much better established words for a close partnership between the state and a set of established major businesses: "crony capitalism" and "fascism".

"Fascism" isn't really a good idea either; in modern use it appears to be nothing more than a synonym for "badness".