I think the move up to a turbine single is driven by maintenance dispatch reliability ("will the airplane work when I show up to fly it?") more than weather dispatch reliability ("is the airplane equipped and powerful enough for the weather challenge I'll face today?").
Turbines give you much higher power reserves at low altitude, so they are better in icing on departure and approach, but that difference doesn't come up nearly as often as generalized maintenance issues. (Owning a 1976 piston twin was an overall negative experience. I loved the airplane, but it was a maintenance hog, mostly aging systems and aging design philosophy related.)
I agree 100% that the piston twin is a dying breed, but I think it's almost never to do with FIKI (flight-into-known-icing) issues.
Turbines give you much higher power reserves at low altitude, so they are better in icing on departure and approach, but that difference doesn't come up nearly as often as generalized maintenance issues. (Owning a 1976 piston twin was an overall negative experience. I loved the airplane, but it was a maintenance hog, mostly aging systems and aging design philosophy related.)
I agree 100% that the piston twin is a dying breed, but I think it's almost never to do with FIKI (flight-into-known-icing) issues.