Guardian: Should slippers shuffle off this mortal coil?
Apparently sales of slippers have declined massively. People do not wear them very much nowadays (this is not necessarily my experience- I've seen a fair few people wearing slippers recently). Two Guardian journalists discuss whether this is a good or bad thing. Interestingly, they don't touch on wearing shoes in the house; they assume that people not wearing slippers will be in socks or bare feet.
I would have have expected slipper sales to have picked up a bit with all the East Europeans in the country, but maybe they too are starting to prefer socks or bare feet to slippers.