I won't really start worrying about the next airplane until the displacements actually start.

But I'm crossing my fingers that Cessna will build the Hemisphere and Netjets will buy it. With .90 speed, stand up cabin, 4500 ish range, and a Planeview cockpit, the Hemisphere would nicely fill a niche that replaces the GIV and G450, DA 2000, and especially the POS, disaster of a purchase, won't touch it with a 10 foot pole, Challenger 605 (the 650 title belongs to somebody else). As currently projected for entry into service, it would nicely coincide with the drawdown of the Gulfstream 450/550 and its price point is attractive. Best of all, it meets the Large Cabin criteria.

The fly in the ointment is the trouble they are having with the engine. It already contributed to killing the Falcon 5X program. It's probably too late to switch to a different engine and Cessna has never built anything this big before. I give it 50-50 on being built, 80-20 on NJ buying it if they do.