"Go forth and multiply" right now! (Well, get married first!)

Captain Sensible writes: It has been said that the creation mandate to "go forth and multiply" doesn't apply to us today. (Despite the fact that we know God is unchanging and Jesus even reiterates the natural design of marriage for humankind in Matthew 19:4.)
But a very interesting point is made in Linda Marshall's Pure, published by Inter-Varsity Press (a book and accompanying course which sadly is not without the usual contemporary flaws regarding a "gift of singleness"):

"Right in the middle of the Adam and Eve story is this verse: 'For this reason a man will leave his father and mother and be united to his wife, and they will become one flesh.' (Genesis 2:24) But Adam and Eve didn't have a mum and a dad! Therefore this verse is deliberately stuck in to teach all the generations to come."

What's that? All generations to come? That means us then...