You get the point. Nobody in that band is irreplaceable, apparently, other than Angus. His brother is out of the band because of illness and the drummer Phil Rudd was told he was canned on the eve of a tour. Its the Angus Young Band, period. Sorry Brian, maybe you can revive Geordie.
My guess is they could replace Johnson with Jimmy Barnes, who is another Aussie of Scottish heritage who has a similar vocal range.
Didn’t a band member get in trouble for murder for hire?