I feel like one of the reason why Nmixx, Baemon and SM's ngg ain't making any waves is because that shift if not totally stopped, at least slowed down by a lot.
People aren't moving on from Twice, Blackpink and relatively younger Aespa the way people moved on from SNSD and 2ne1.
And it's not even the direct successors that are being hurt, I'd say even Teddy group(s) haven't made a big splash yet due to BP remaining active. The massive influx of new fans with the rise of BTS and 3rd gen as a whole isn't the type to move on to younger groups like it used to happen and industry is facing a dilemma whether to adapt or not.
So far it seems like agencies aren't reacting as they should snd continuing to debut new groups at similar rate and losing money.