Just what the yanks were looking for, a diesel powered 172. It'll probably sell just as well as the diesel powered 182, which means, not a lot.
As OZ3 suggested, all a flying school needs is a 160hp avgas powered 172, with steam driven instrumentation, rubber mats on the floor and cloth covered seats under your backside.
The current Cessna management (accountants, all of them) are not interested in single engine anything, Caravans included. As has been pointed out elsewhere, about all they can see are Citations and government contracts. They seem to be hell bent on running down the single piston sales to the point where they can make excuses about closing down production because of poor sales.