I don't have any doubt that Real Madrid would be able to provide the same contract conditions to Mbappe if they want. However I don't expect any official offer from them in the near future. Especially after he has preferred to stay instead of signing for Real Madrid, there is no need to push their luck now. Mbappe is clearly happy with his game here.
There would really be another opportunity for Real Madrid in the future. But they don't even need him for now to be successful. Ancelotti is very pleased with the team quality now and he is already doing a marvelous work. While you are able to win the Champions League with the current squad, there is no need to splurge on a player.
I think no other club would have given Mbappe the number of opportunities PSG management has given him. And that's why Mbappe has been interested in joining Madrid every season, but he ended up signing a contract extension with PSG. PSG paid a lot of money for Mbappe. But teams like Madrid or Manchester United are ready to spend this amount of money. But they won't let Mbappe interfere in the club's internal affairs. PSG management, on the other hand, prioritizes Mbappe's opinion on all matters internal to the club. This is why Mbappe is not leaving PSG. It is foolish to think that Mbappe is only at PSG for money.