Actually, that was their form of escapism as they both were non-assertive, Elvie to the point of being an anti-social recluse. As such it was merely benign, but also a bit pathetic.
Elvie was a head case throughout the movie. Only in the end does she take the first steps toward normal human interactions. I didn't see any deeper meanings in the theme other than a vehicle to showcase the star's singing talent amid some actors portraying uncaring or exploitive characters.
By letting the house burn down??