Mr. Gamble hit the nail on the head, albeit unwittingly, and it goes beyond Skyview.
Having the latest, most-likely-to-be-supported gizmo only puts off the inevitable a short while. Eventually, your airframe will be just fine, but that joy-box in the panel no longer works or is supported. Then what? Never upgrade? Build a new panel? Build around obsolescence from the start? Rather than fret over whether or not you can virtually see the ground you're about to CFIT because of foolishness, wouldn't round gauges suffice for a -12 with the virtue of distributed failure, and multiple supply and repair sources for a long, long, time?
Oh, I like the boxes for their compactness, freedom from the effects of vibration, and some of the computational capability. But I recognize that I'm building a computer into the airplane, and we all know what happens to the fanciest computer in a few years - obsolescence.
So why not a Skyview in a -12? More money. Boxes everywhere (you have to run pitot as well as static aft). No greater capability than "legacy" - which is to say boxes in production more than three years - appropriate for a -12.
John Siebold