Munger's death didn't affect BRK noticeably but of course he's just 2nd banana. If BRK sags, they can always institute a small dividend. The original group of Omaha billionaires are almost all gone now. Those, along with Buffett and Munger, are the shareholders who opposed dividends. They didn't need the cash and they didn't want to pay taxes on something they didn't want.
My *guess* is BRK won't move much if Buffett passes away and if his death causes the stock to underperform for awhile, the company has options for propping things up, Including splitting the A shares. Perhaps 100 for one but not much more They want to keep the riff raff out. Both Charlie and Warren would agree on that.
It'd be a cryin' share for bunches of day traders to target the annual meetings to pump the stock for short term flips.
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Because the Good Life is Just a Pump or Two Away