Actually, the phrase has been around for a long time.
I've seen academic references to it as early as the early 1990s, and I recall some comedian using it in the 1980s.
It has definitely been said by Yogi Berra, but I can't tell you when.
It was also a quote from Angel Heart (1987).
I'd be surprised if it wasn't used by Phillip K. Dick or Kurt Vonnegut, Jr., but one actual attribution of the quote I can find by an author is to Arthur C. Clarke.
But the oldest attribution of it I can find?
"The trouble with our times is that the future is not what it used to be."
Paul Valery (1871 - 1945)
Like Picasso said "If you're going to steal, steal from the best."