A prediction that should be banned

Forgive, for I am about to don a tin hat, and pen a criticism of the sainted Warren Buffet, normally a model of clear, if folksy, business communication. But, really, why give people this hostage to fortune, in the most recent letter to his shareholders:

Now, as in 1776, 1861, 1932 and 1941, America’s best days lie ahead.

My concern is not that it might be true, or, indeed false, now. It is rather that, one day, it will definitely be false. I suspect in years to come, we will sift many attempts at homespun boosterism like this, and wonder, why were so many willing to be called out on such hubris?