I think this will be an exception. Pep knows an elite striker is our only real lacuna (ok, there's also penalty-taking, but a striker could solve that also). I doubt we will be penny wise/pound foolish in replacing Kun.I don't think Pep will ever go for a big player fee and be held hostage of the investment, this does not align well with his philosophy to rotate and create competition between players, you can't just buy a 100+M player and put him on the bench.
All this talk about Mbappe and Haaland I just don't see it happening, Club's credit card has a 60M limit per transaction :)