I don’t know about forward in time, but like he says, this will give us a way to look back at the first moments of creation, which no form of electromagnetic radiation could possibly achieve.
I think the most exciting thing, which he kind of downplays actually, is that EVERY time astronomers open a new window on the universe, they discover new, unexpected, mind-blowing things going on out there. What will it be this time? We can’t even guess.
And still we hear the echoes of God’s arc through the heavens.