Laughably conservative?

I enjoyed this quote by Arthur C Clarke (Google's 'Quote of the Day' today):

"If we have learned one thing from the history of invention and discovery, it is that, in the long run - and often in the short one - the most daring prophecies seem laughably conservative."

I wondered how many other predictions will end up being seen as 'laughably conservative'. Our conceptions of God, the universe, heaven.. just for starters!