It's plausible that this week's episode laid the ground work for this. Mind you, Mycroft was lying about Sherlock's father cutting him off, but he did suggest they may need to take more cases from paying clients, and one would presume that the need to focus on the NYPD in every case is part of what is driving then to…

Every time I'm bored, and want to just throw on the TV, and I turn to HGTV (because, obviously), and Love It Or List It is on, I involuntarily throw up.

They're longer now!