The infamous two body problem is well known and.. you know.. sucks. Not to take anything away from that, but discussion of the two body problem overshaddows the oft overlooked one body problem. Especially in this year's market, you better be happy taking a job whereever you can get it. Flying solo makes getting the job easier, but sometimes makes enjoying the job harder. There are lots of places without many potential suitors. Sure, some of it's that a lot of tiny college towns don't have that many people around. But if a lot of us are pushed into fixed terms, it's not unreasonable for potential partners to be less interested in a philosopher who's moving out of town in a year.
Let's just say that if you took a year or two off before grad school, the Ph.D. took 6-7 years, and at some point you want kids, scraping by a few more years in a place that doesn't have many prospects isn't a recipe for happiness.