Saudi Arabia may well be a real option for the transition stage before the end of Mbappe's agreement with Paris Saint-Germain, no matter how fantastic it would have sounded six months ago. At least there seems to be such an offer from the Saudis to invite Mbappe to Saudi Arabia for a year, given the damaged relations between the PSG leadership and the player. Then PSG would get money for rent, and the player would get game practice, and I'm also not sure that Luis Enrique is excited about the idea of building the future of the team around a player who will leave after a season.
Even if Saudi Arabia enters negotiations with Real Madrid, mbappe will not join the Saudi league; if mbappe joins the league, his career will be over since he will not enjoy playing there; mbappe is still a young guy who needs to play in the European league; and mbappe is only concerned with money. If MBeppa does not arrive before the start of the next season, Madrid should look for another player to replace him. If Madrid signs Kane, he will be a better person to replace Benzema. If Madrid does not sign a replacement for Benzema, Madrid will suffer in the attacking line.