52/42 was the norm for race bikes for a good time.
If you don't need the lower gears the 39 gives you the 42 will shift a bit better than a comparable 39 tooth ring, and a bit tighter spacing.
If you don't need a lower gear, I wouldn't change it. If it's not low enough for you, then going to a 39 tooth ring is pretty easy and inexpensive.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.