15000 miles of touring and commuting - yes, you should take a look at the headset, BB, rear hub.........everything.
You probably mean the cones when you say inner races. The cones usually go first, and are usually easily replaced. The "outer races", or hub bearing races, are not replaceable, at least not the ones I've dealt with. Are there any that are? If the races are shot, you need a new hub or wheel.