I think the more Alcaraz plays Djokovic the better. Not just for his rivalry with Novak but for his general tennis ability (he won’t find a more complete player on tour right now, and not many who can hit with the kind of depth and consistency that Novak can bring).
These matches also give Djokovic opportunities to continue to figure out Alcaraz’s game, so the short-term effect might be a negative one for Carlitos, but long-term it’s only good.