Real Madrid knows what is best for itself in the future, so it will not immediately be fooled by recruiting Mbappe if there is no more reasonable clarity and just to spend more money without anything that Real Madrid itself can hope for. I also agree more with what you say because young players will be more suitable to be maintained and polished well for the future of Real Madrid rather than continuing to think about new players even though their age is not yet in the old category.
Real Madrid will definitely move on from the mbappe deal if it continues to remain unclear for more than too long because the team definitely needs a striker but it's not a reason they will continually sort after a player who seems confused and isn't at any point making things clear as it regards his preference and where he would love to be soonest.
Talking about young players ,mabappe still got some time on his side so he isn't an old player he's still young and have got a whole lot of potential ahead of which if he's at the right place of which Madrid isn't any bad, he will scale up the peak of his career sooner and one of his dream which is winning the UCl will be reality. Madrid could further focus on training and developing young players well enough that in the nearest future they form a very formidable team across Europe, they can even groom a striker who would stand in the position mbappe would have occupied if the deal had pulled through.
Real Madrid still hope Mbape would prefer a move to their club than him signing a new contract at PSG,If Madrid did not sign Mbape this season,they will still chase him in the summer as it is very unlikely that Mbape will remain at PSG for the rest of the season and try to win the UEFA champions league with the team,even if it's impossible winning it.He still wants to try his best to make history with the club,and win something tangible with PSG.
If he makes a move to Madrid,it would be one of the best signings of the summer because everyone knows the quality of Mbape,and his move to that team will bring glory to the team.
Moving to Real Madrid off course would be the best decision he has ever taken in his entire career, in the next five to six years, winning the Champions League Competition is a must with this club, they're always mentally ready for big games especially during the Champions League games.
If he doesn't find Real Madrid appealing no more, then he should switch to one of the big clubs in the Premier League who can access whatever he demands and pay him comfortably.
I'd love to say Manchester United, but the theatre of dreams no more that, it should be the theatre of shattered dreams.