I think Real Madrid better sell Hazard during have good price than waiting he back good performance, more than three season on Barnabeu Hazard never give good performance like on Chelsea before. Better looking great partner for Benzema and Mbappe is the best option but have higher value, so barter Hazard and mbappe is the best way if PSG want deal it.
I had the same thought, while still playing in Chelsea, Eden Hazard looked shiny and he plays a key role there. But when he moved to Real Madrid, his performances didn't look good (just occasionally he looks great but can't be consistent in every game). So there is nothing wrong with Real Madrid selling Hazard because the funds can be used to buy other players.
Besides Mbappe, Harry Kane is also a good option for Real Madrid, it's just that Kane's transfer value is also high. Or it could be Jadon Sancho because it seems Dortmund already rejected Man United's offer of £67m for Sancho.
Selling Hazard is not worth it now. They won't give good money for it. I think I should give him one more year. In the past he was not allowed to play at full strength of injury. I hope they will bypass it next year. Real Madrid is likely to target the purchase of Mbappe. And the attacker will take Lewandowski. For a couple of years he will play at the proper level, and after that it will be possible to buy Holland.