It sounds like what you've said points you to an Oly. I like the idea of doing a few more sprints for practice and fun. This is loosely what I have planned for myself next year, we'll see how training goes with the wee one. I'm already anxious to get back out and do another sprint, without being pregnant, so I can give it my all.
In the meantime, you talk about currently being aimless. Can you find some other fall events to look forward to? I'm still planning to do a 5k at the end of October. I needed something to motivate me to keep running so I don't just drop it and then have to start all over next year. I'm also still trying to talk myself into going to a spin class at the gym. I'm so jealous you're going to a TI workshop, I'd love to do that. DH and I taught ourselves through the book and DVD, but a workshop would be invaluable. October is just around the corner, it'll be here before you know it, then you'll want to keep swimming all winter to perfect your technique. I think it's perfectly normal to feel a little aimless after the highlights of the season are over, but there's still plenty to do. The aimlessness shall pass.
The best part about going up hills is riding back down!