I've had many similar experiences recently, I find either very little or nothing piques my interest. I'm not sure if it's because I'm viewing the world with tired and resigned eyes, or what it is, but I'm not finding much inspiration out there right now.
Going to new places or new kinds of places might help. This is hard for me, traveling by foot most of the time, but I try. I also look down a lot. Many subjects are found at ground level.