The nosedive that "Trading Spaces" has taken can be blamed on one, huge, undeniable fact: since around the time that Vern Yip left the show, they haven't done a room that anyone with a full set of chromosomes would want in their house.
Okay, there are a few that came close, or were simply "eh" in their execution. But it seems the true slant of the show lately is just to come up with new things that are less innovative as they are shocking. It also seems they're trying like crazy to get bad responses from the homeowners. Granted, the "I'm going to have to leave the room now" lady did more for this show's ratings than anyone or anything else... but this isn't why the bulk of people are watching. If they were, then why was Vern, with his tasteful, RESTRAINED redesigns, so popular?
Get back to decorating for real, people. And get some designers who actually know design... watching Barry or Hildi screw up somebody's home is not my definition of entertainment.