My patience with games seems to be sliding inexorably toward the Abyss.
Large page counts dampen my enthusiasm.
Any complexity north of AD&D sours me.
Games that get too meta with the narrative no longer appeal to me.
I find that, while I have a substantial collection of rpgs, my tastes continue to grow narrower. When a game doesn't fit my increasingly exacting specifications, it goes back on my shelf, or I take a scalpel to it. (As I have been doing with Dead Reign and want to do with RIFTS. gods help me.)
I want quick character generation. I want quick combat that doesn't require minis. I want task resolution to be either ad hoc or incredbilyfrigginsimple. I want books that aren't thick enough to double as anti-shiv body armor. I thought this was just a phase, but my brain and attention span continue to reject games that I even want to learn, like Shadowrun 4e and The Dresden Files RPG.
This may my brain going into survival mode, as my unlimited free time will be quite limited starting next week and progressing into next May as I edumacate them chilluns. It might also be precipitous slide towards the age of thirty (one year, one month, and four days...) It might also be one of those phases I go through.
Another pop-psychology theory is that my previous career was so mentally unengaging that I needed my hobby to step it up to keep my brain from pickling inside my skull. That subject, however, goes beyond the scope of this blog.
Save the complication for the dilemmas the PCs find themselves entangled in, I say.