Definitely wouldn't want a flight to be delayed or missed because of something like that. I think the realization is there that there is a 50/50 chance that you'll get one with IFE, and if not....then tough luck.
Now taking a look at the fallout from the ash cloud in Europe...I know that many of the European airlines at MCO...from BA and VS...they had to obtain some extra jets (charter jets) to try and get those stranded passengers out. All of BA and VS long-haul fleet have PTV's, and those passengers were stuck on board non-PTV 767s and ancient Omni Air DC-10s.
Now...would you complain to VS if you were put on a DC-10 back to LGW? Talk about a major downgrade in equipment and entertainment.