Rimrock,
What I "think" might not be what actually happens.
Every instance and every dog being different...
I'd say it depends on the dog to a certain degree.
Some of them just have pointing bred so strongly into them that it's not going to change much.
Others, those that had to be trained and conditioned more to whoaing on birds might lose their staunchness.
I guess from a 100% accademic standpoint you'd NEVER shoot birds that weren't pointed over a dog that was holding rock solid.
But then in the real world of hunting you might never GET any birds!