However, the problem is how to ensure PSG releases Mbappe. I think it will be difficult to negotiate with PSG, they will try to keep Mbappe as long as possible.
When it involves a lot of money then I think PSG will relent and consider offers.
So far Mbappe can be expected to help PSG win the Ligue 1 title, but he has not been successful enough to bring PSG the Champions League title for many seasons. PSG might be able to consider other players who are also of the same quality, even though it is difficult but there are many players who might be expected to make a big contribution to the team's achievements.
I also don't think it's easy for PSG to let Mbappe go to Real Madrid, but they have to be capable enough to see the different potential of other top players who both support the team's achievements.