Yeah the better discussion moving forward will be where Mbappé ends up on the all time list and the Mbappé Vs Ronaldo debate.
Messi sealing his legacy as the goat might have killed this debate but Mbappé excelling at the highest stage - again - where Ronaldo has never been able to, opens up a new debate.
There are 3 things:
1. Achievements: Mbappe can achieve more collectively with France (and already has compared to Cristiano) because he plays in a much better French side than Cristiano's Portugal at the same age. But at club level it will be incredibly difficult to match what Ronaldo has won collectively and individually (5 ballond'ors, had already one by age 23, Mbappe has zero podiums at age 24 but probably will be in top 3 this time). The 2 will probably cancel each other out.
2. Longevity: The other question is longevity. For Ronaldo, it came through will power and determination to succeed with Messi as the benchmark. Few, if any, players in history have had the drive Ronaldo has. Will Mbappe have the same drive? Remains to be seen.
3. Performances: I think Mbappe is a similar style of footballer to Cristiano but actually faster/more explosive and somewhat better technically so probably has a higher ceiling although Cristiano's ariel ability is much better. Where Mbappe might struggle is when his explosive pace inevitably drops by a yard because he is very reliant on it as was Cristiano; the later morphed into a poacher, Mbappe might have to as well.
In the end, Mbappe might be defined more with what he does with France than what he achieves individually or with his club. I sense more competition for him though due to the likes of Haaland (will break all scoring records, although lack of success with Norway may hold him back) and Musiala (if this guy just gets his end product right, he can surpass Mbappe because he is technically better ,has qualties of a classic no 10 and plays for a big footballing nation).
Ultimately while I totally agree that Cristiano vs Messi is now a pointless debate ( the later was always easily the better footballer, that for me was never a debate), it would be completely wrong to totally ignore all that Ronaldo achieved regardless of how idiotic he is. He has his place amongst the greats.