Indeed which is why a DLC in High Rock should be in the works. Side with the Bretons or Orc. Skyrim already has a great "revolution" system in place with being able to take cities for the Imperial or Stormcloaks. I think this would be a great time to start another war involving 2 races that haven't had much light shed on them throughout the series. Dreaming I know.
I see some problems with this,
1# There are a lot more Bretons In High Rock then there are Orcs, and unlike the Stormcloaks there is no homefield advantage.
2# High Rock is still a province of the Empire.