"Normally, yes, skimmers that move flat out and that receive an 'immobilised' damage result are wrecked.
Only exception is "vectored engines" for Eldar (which counts the vehicle as going at a slower speed band to avoid the wrecked result)."
I just looked up the Vectored Engine Vehicle Upgrade (Codex Eldar P. 44)
It says "If the vehicle would crash due to being immobilised, it instead makes a forced landing as if it had not moved that turn"
Okay. So the Falcon lands. It can now be assaulted as a stationary model with automatic hits.
But, should it survive, is it then free to move unimpeded in its next movement phase?
Though I take your life, I promise you the stars...