Wow. I can so relate to your post.
I started running for the first time in my late 40's and did the thing like you--got involved, ran a few 5Ks then a few 10Ks, then a few half marathons...bought the gear....read the books and mags....the whole drill.
Then one day I woke up and looked at my running shoes (all neatly set out the night before) and said "meh," and went back to sleep. Rinsed and repeated that a few times. Didn't like it. But didn't want to run either.
What got me back out on the streets was two things. One, I didn't like gaining weight/losing fitness and two, I needed SOMETHING in my life to alleviate the stress of well, life. I had a road bike. So I started biking. A lot. Truthfully, I don't love biking and probably never will, but it was something different to do (and yes, more gear and more books and mags to buy). Then I got into the idea of triathlons, so I started that. You had to keep running to do that, but not as much (1-3 times a week) and you interposed swimming and biking with that so it was never constantly just, well, running. And yes, more gear and more books and mags.
I finished my first 70.3 this spring (at age 53) and all of a sudden I'm back looking at my running shoes again in a different light. I've signed up for my first marathon. I'm still swimming and biking every week, and only running 2 days a week, which helps with the monotony of these mojo killing thoughts: "running. That again. Oh joy."
So, take some of the advice here and put your shoes away and go do something else. Different. Kayak. Golf. Play tennis. Buy trail shoes and do some trail running. Mountain bike. I dunno, maybe even ice skating or hockey or basketball. Make it something that is exercise-like, so you keep up a good fitness level, and make it something that makes you smile and grin (if you throw golf clubs and swear, golf may not be the idea). If you are were always up at dawn for running, pick a sport or activity you do at night. If you were a night/evening runner, pick a sport you do in the morning. Mix yourself up. Forget about the guilt factor and forget about the running shoes for a while. Then in 4-6 months look at them again. See if they look interesting again. I suspect they might.
Keep us posted. The rest of us back of the packers want to know how you do!
Terry
www.fiftythreetoseventypointthree.blogspot.com