Actually, quite a few set-top boxes do run Java and thus some form of a JVM (though perhaps not HotSpot). Of particular note, Java (specifically, BD-J) is a mandatory part of the Blu-Ray standard in order to implement things like interactive menus, disc updates (for post-release subtitle updates, for example), etc., so literally every device with Blu-Ray playback capability runs a JVM (probably HotSpot). I'd reckon most of these run 32-bit processors, and probably will for the next several years.

This isn't the only case where Java is part of the standards for various set-top boxen. Java's also commonplace as middleware on cable/satellite TV boxes, and (IIRC) some "smart TVs" use Java extensively.