At the request of @StudioBlenderCo, I created this little addon which cycles between all the active cameras in the current scene (one at a time) with each click of Ctrl+Alt+C.
https://drive.google.com/open?id=0B7lxAqa0cRXiQ3daUDBKMmFETFk
It can be installed like any other addon and can be found under the 3D view panel after installation.