It's worth noting that Buffett made this decision after taking a phone call from the President of the United States. We can only wonder at the details discussed, but Buffett excels at reading a macroeconomic climate. He's risking capital on a bank that has been first in line for government bailouts for several years. Too big to fail means no investment can fail as long as the government is there to backstop a bad bank. Mr. Buffett's political fundraising is his way of saying thank you.
Average investors who mimic the moves of the plutocracy may do very well indeed, provided a jealous neighbor doesn't prompt law enforcement to levy an asset forfeiture action against them. Don't ever say America has ceased to be the land of opportunity.