Currently there is a dependency cycle between camel and camel.impl. While I think there is no problem when impl uses camel the other direction should not occur. Luckily there ist only one case where this happens. The class CamelTemplate from camel uses ServiceSupport from impl.
As a solution I would suggest to move ServiceSupport and Service to util. ServiceHelper is already in util and Service as well as ServiceSupport do not need any other classes. This would help to break the dependency cycle and at the same time move some classes out of the already quite big camel package.