PSG will keep spending. And eventually will sign a top manager who can win the CL.
Barca and Real will always be around. Perez will replace Ronaldo and co with other galacticos and with the record in CL players will want to join Real. There is even talk about Neymar going there potentially. Not like these things havent happen before (Figo).
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You make it sound like Man Utd doesnt spend big?
This is like first expensive signing Liverpool made in years.
Meanwhile Utd buys Lukaku for 85m. Pogba 100m last year, Martial for 60m before, Di Maria 75m the season before. That just one player price in every summer, not including other additions like Mkitaryan, Matic, Lindelof which goes like 160m combined.