4468
The underlying principle is that the ONLY back up is an immediate IFR climb above safety altitude, or an immediate landing. If one is unable due icing, or unqualified, to confidently conduct BOTH an IFR climb, and subsequent instrument recovery to a suitable diversion, then ONLY an immediate landing remains.
However, if at the same time, the terrain over which you are flying is not suitable for a landing, then your options have disappeared. Tragically the result is then inevitable.
I don't agree with that, what about flying on, low and slow (30 kts) in sight of the surface until finding somewhere suitable to land?