Absolute sublimation doesn't happen at pressures and temperatures that are much lower than anything an airliner will ever experience.
As far as ablative sublimation, or that caused by the sunrays, it works extremely slowly, especially for any surface that is somewhat tangential to the airflow, as the boundary layer will effectively 'protect' it.
So in the hypothetical scenario I evoked, here's to hoping you wouldn't rely on that to get rid of any ice that might have blown back on T/O and reattached itself to the back of the wing or crawled into the control surfaces rather than land and get rid of it.
Call me paranoid.