It really depends on the producers. On one hand netflix is greenlighting everything it can hoping to get a new Squid Game, killing everything that does not become viral in the first season. But then you have series like Fargo, not even producing a season per year, while maintaining the quality constantly stellar over 10 years.

Has the amount of disposable tv series increased? Absolutely. Has the number of overall series increased? Also yes. I cannot tell you the ratio between shallow/complex, but saying that “nothing new is made anymore” is just wrong.