Maybe some people will not buy today, but they'll buy tomorrow when the price is lower and they want to enjoy their finite lifetime.
They won't buy tomorrow when the price is lower because it will never be lower as we approach the "next four years limit".
He was referring to the price of goods decreasing as value of a bitcoin increases. Eventually the value of bitcoins will go high enough and the price of the goods will go low enough that the person will feel rich enough to spend his bitcoins. To take it to an extreme, if a person has ten thousand bitcoins and can buy the TV of his dreams for one bitcoin, the value of having the TV now is greater than the future potential increased value of the one 10,000th of his total bitcoins.