Just like many other players, Benzem chose money and he joined Arabian teams when left he is getting old to earn more money there.
I think Benzema made a wise move and Real Madrid should now hire an alternative player for this position. Mbappe is the first priority and I guess Mbappe can fill Benzema's position at Real Madrid perfectly.
If Mbappe's transfer to Real Madrid takes place, a football player who will play successfully for many years as Real Madrid Benzema will be brought to the team. I believe Mbappe will outperform Benzema. What he's done for PSG is obvious and he's a perfect player statistically.
That's right, it could make his career even better if he was with Real Madrid while outperforming Benzema and if he has no doubts about returning then the sooner the better. We know Real Madrid have tried many times to sign him, but Mbappe prefers to stay in Paris and that is also a waste of time for him if he wants to be the best player in the world.
At PSG he will only win the domestic league title, but if he is at Real Madrid he can win all titles including the champions league. But unfortunately mentally he is not ready to leave Paris and maybe we will see developments regarding his future before the end of the summer ends.