Management at Cessna these days aren’t interested in Cessna single engine anything (Caravan included) and haven’t been for decades. I wouldn’t hold your breath waiting for Cessna to start cranking out spar carry thru’s after having effectively abandoned the 210 years ago when they destroyed the tooling.
If memory serves, one of the reasons they gave at the time for not puting the 210 back into production was that the spar carry thru (amongst other things) did not meet the current certification requirements. It was suggested from an engineering point of view, Cessna couldn’t make it happen. You would’ve thought for a manufacturer to be able to design, certify and then put into production an aircraft like the Citation X, coming up with a solution for the 210 spar carry thru would’ve been relatively easy. Evidently not.
Cessna haven’t put any REAL investment into their S/E line up for nearly four decades and aren’t going to start now. They’d be more than happy to let the 210 fleet whither on the vine. Time to start visiting the salvage yards.