I also think Mbappe won't be able to move to Madrid this season because it would be huge money for the club. Real Madrid won't pay that when next season they can buy Mbappe at a reasonable price. I think nothing serious will happen if Mbappe doesn't play for Real this season, although they will miss such a striker.
If Real Madrid doesn't really need a striker like Mbappe for next season, of course the solution is to wait for a reasonable price after Mbappe's contract period with PSG is over. But if Real Madrid still really needs a striker like Mbappe to have a surprise next season, at least Real Madrid should try to get Mbappe even though the price is slightly more expensive. Because next season Barcelona is predicted to still be very strong and Real Madrid must be able to compete to get back to being better in La Liga.