Der Spiegel on Cameron:

"By the next morning, no one is thinking of Cameron anymore. He made history, if involuntarily, but history has now moved on from the British prime minister. The vote in favor of Brexit, after all, hasn't just convulsed British politics, it has also set the stage for the next monumental power struggle within the EU."

Read the article here.

I guess Cameron prefers to make history involuntarily to making no history at all.