Obviously PSG want a lot of money. PSG certainly do not want Mbappe to leave on a free. The price makes big clubs doubtful. So if Mbappe doesn't leave then he must be willing to sign a new contract extension. While Mbappe is reluctant to do so.
Maybe if the price is still reasonable, there will be many clubs competing to have him. But with a price benchmark it might be a little difficult. Even when compared to Ronaldo when he came, I prefer his style of play and Mbappe is still below his level.
[/quote]I don't think Madrid will agree with highest transfer fees for PSG during Mbappe contract left one year and become free agent next year, its not beneficial position for PSG because one year contract left can't guarantee with Mbappe want leave and stay until his contract over. No doubt with Mbappe performance and actually he has higher level than Messi or Ronaldo, but joining with bigger team has chance for Mbappe will get better achievement in the future.

Still unclearly with Mbappe future will stay with PSG or join with Real Madrid, I can't speculate Mbappe will join Real Madrid because he was ever reject with Madrid offer last two years.