If you're talking about colonization for a place to live, then I think people would start with the Earth's moon, Mars, and as mentioned earlier Europa before they consider Titan since they are closer to our planet. Closer in distance means that there won't be as much resources involved which in turn means that not much money would be spent and we know how much people love money.
I'm not saying that it's not a possibility. If and when we do colonize Titan, it'll probably be for harvesting the gasses there for fuel/energy, because there have been recent studies that found hydrocarbons on Titan. This will probably happen once our natural resources have been exploited. Quite sad, but quite possible.
