Glider, I know how you feel and can relate.
Myself, I feel like I am nearing a tipping point. Like you, my intense interests have a tendency to cycle, though not necessarily seasonally. They cycle around goals that I set for myself within the interest. There is no doubt that my current intense interest is AS, which is primarily centered around WrongPlanet. So I don't mind that it takes away from my other interests; that's why they call them intense interests.
When I came here, I came to do research. My goal was to make observations about myself and come to some conclusions. I feel very strongly that I am nearing that goal. My time becomes "vulnerable" to another interest coming in once I've reached a goal. So that means that one of my other interests will probably swoop in and take up all of my time. I don't know exactly when that will happen, but it will.
Anyways, from one of the few people here who knows the origin of the name "glider," I wish you the best!
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"That leap of logic should have broken his legs." - Janissy