Would be a strange situation for Inglis if it did happen, it's not as if he moved to Australia as a toddler. Wouldn't be surprised if he was still primarily an English supporter. A third, very outside chance for next keeper is Jimmy Pierson. More a batsman-keeper but his average doesn't really doesn't show that, however, he is a good leader.
Travis Head has been seen as future captain, but obviously has recently been dropped and not for the first time. Cummins as captain always comes up but don't think a bowler will be made captain. Will be an interesting few years as Australia may experience a bit of the drop off like we did in the late 00's - early 10's.