And just like that, talent agents are hot on their mobiles.
Yet no matter whom they hire, we'll miss the inimitable tones of Shearer, because he brought one particular gift to the show that's irreplaceable: No one does the ring of authority quite like Harry.
That's the thing about Shearer: He can deftly play most anyone who is either in charge, or who needs to sound as though he's at the controls. But he doesn't have the "voice of God" delivery of a Morgan Freeman. No, Shearer put a certain English on the ball with each role. It was the waver of the weasel, or the over-enunciation of the huckster. Whether it was the news or nuclear power, these men were often selling you something - frequently the belief in their own shaky authority (though sometimes it could be the simple sweetness of left-handed tchotchkes). Shearer's mellifluous men could often dial it down, true to the grounded nature of human worms, squirrels and snakes.
Which brings us to Shearer's greatest character presence, riffing off the genius of one of the show's founders, Sam Simon, The Tracey Ullman Show writer and co-executive producer.
Shearer has been special as the Bart-challenged Principal Skinner and the moralising Ned Flanders, of course, as well as Eddie and Lenny and Reverend Lovejoy, Jebediah and the judge and Julius Hibbert - plus the smooth-news guys like Kent Brockman and Dave Shutton. But The Simpsons is simply not The Simpsons without Montgomery Burns - the man who looks a bit like Fox boss Murdoch, crossed with every modern Ebenezer, including Judge Potter and the Grinch, but was actually inspired by Simon's fear of ol' Fox broadcasting honcho Barry Diller (with a vocal side of more Barrymore).
If smart Marge is the heart of the show, and chubby-hubby Homer is its soul, then Burns is its soul-less. Monty is the dark side as a reptilian billionaire, and from those scales, Shearer delivered a quarter-century master class in quips and pivots and silky line-readings that helped Burns become the show's most quotable character not named Simpson.
So it seems unfortunately coincidental that the Simpsons overlords look a little Burnsian as they - in the eyes of some fans - release the trap door, and the hounds, on Harry.
Once upon a time, the show, co-led by the recently deceased Simon, liked this fellow Shearer and the cut of his jib, as Mr Burns might say; they landed this "young hellcat" and declared him to be "Excellent!" Now, we can only hear the echo of a Burns quote, as delivered by Shearer himself: "What makes a man endanger his job ... by asking me for money?" (Or for anything else?) Cruel business, this, and so often it comes down to money on both sides. But for 26 seasons in this dog-eat-dog industry, gifted Harry Shearer, voice-actor employee, got to be the one vocally manning the trap door and deliciously releasing the hounds.