Warren Buffett could wait forever. His successor may not be so patient.

Greg Abel might not be as patient as Warren Buffett, Michael Burry says. Theron Mohamed/Business Insider Warren Buffett stacked huge amounts of cash in his final years as Berkshire Hathaway's CEO. Greg Abel has reduced the cash pile by ramping up stock purchases and buybacks, and striking deals. Michael Burry says he'

Berkshire is buying its own stock after years of building up a cash pile. Not everyone is excited.