Will there be a USAF 50 years from now?

Imagine all the combat planes are UCAV’s. No more Single Combat Warriors. Do you need a separate Air Force?

I’m not trying to start a debate on piloted versus unpiloted airplanes, rather I am saying lets be hypothetical and just for the sake of discussion say that unpiloted airplanes work out very well. Just for the sake of discussion, can you have a separate Air Force with no Airmen?