Mbappe will get at least 2 more. If Messi wasn't in the Argentina team this year he'd have got his second. He's 23.
What wins a world cup is a team, not individuals.
France will be a menace for at least the next decade.
France went home early to Switzerland on penalties last year at the Euros (Mbappe missed a penalty!). That could happen again in 2026.
Also just luck. You can be in an "easy" play-off pool or a "difficult" one, you can have "easy" or "difficult" quarter finals, semi-finals, and finals.
Of course it still takes great skill and preparation from the entire team to win no matter what, and I don't want to take away from that, but the way the thing is set up means that in the end, "winning" doesn't mean nearly as much as it's made out to be.