It's an idealistic argument to believe that hedonism, a symptom, is the primary cause. It individualizes a structural problem that stems from the material base, since it doesn't question the fundamental causes: real estate speculation, which makes it almost impossible (unless you're saddled with debt for life) to access housing, and therefore impossible to settle down and form a family. Unemployment, precarious, almost slave-like working conditions. Geopolitical tensions and economic blockades that scarce resources and increase their price, thus increasing the price of services and the cost of living.
Before blaming people for prioritizing immediate pleasure, which becomes a cultural problem (superstructure), we must examine how decadent the material base truly is.