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It is very likely that Enrique will try to find replacement for Mbappe, but there is no certainty who will really be worthy to replace Mbappe in the PSG squad considering that they are team that has great players who really retain them.
If Enrique doesn't immediately look for player who can replace Mbappe, I also doubt that PSG will be able to play well, especially in an important competition like the UCL.
Luis Enrique is a very competent coach, he has good experience in how a team works, moreover he has managed the Spanish national team, currently the new players PSG bought (L Beraldo and Moscardo) have started to blend in with Enrique's playing pattern, even though Next season PSG will play without Mbappe but I'm sure they will still dominate Ligue 1 but to reach the UCL championship I doubt they will be able to do that.
In terms of capacity, Enrique is one of the right managers to bring PSG to success in the Champions League, PSG management must give him more time to make it happen. Like Pep Guardiola at Manchester City, I think that is a very relevant example, where Pep Guardiola was finally able to bring his fleet to this prestigious trophy after several seasons as manager.
PSG must change their transfer style, adapting to Enrique strategic needs, a common perception can facilitate their journey to win the Champions League trophy. Mbappe departure is very disappointing, but PSG must forget it and look to next season by rebuilding the depth of the squad according to Enrique wishes.
At the domestic level, PSG will still be able to dominate the competition, the gap is still very visible between PSG and other contestants, the influence of financial strength makes it easier for PSG to conquer Ligue 1 every season. Over time, I think PSG will be lucky in the Champions League, but it all takes time and patience.