I don't think the Good Lord ever 'demanded' it, yesterday or today. He did make a good case for it though, same argument holds true for the guy in 150 AD or 2005 AD. Can you give up all for the sake of the kingdom? Some can, some can't.
The Good Lord never demanded celibacy. He just asked those who can accept it to accept it.
Those who can give it up for the sake of the Kingdom are not giving it up, or they're hedging their bets.
They're young, colleen, not a senior citizen like me, who would not hesitate to accept a call, as long as my wife could come along.