I've not really played games for the last 18 months. In that time I've bought 4 games, Pokémon X, Pokémon Omega Ruby, MK8 and Nintendoland. I think at the root of it for me is lifestyle changing, or as Bob put it I'm getting old. I have other responsibilities, hobbies and interests I'd rather put my time and money into.
I think the hardest part is getting over the hype and excitement of launches. If you aren't interested in that any more you can just pick up a game when it suits you.