Perhaps you mean the phenomenon of popular artists that are so big that they are household names across all demographics across the globe/nation. If so then your probably right. Probably we will see less new justin timberlakes/drakes/britney spears level superstars, and more local/regional/niche stars.
as far as the investment, really labels/mangement companies will continue to invest in whatever makes them money... the size of the investments will probably diminish, but realistically the breakdown of record label investment is 90% marketing/promotion. And realistically if your projected to sell 50% less you should cut your marketing budget appropriately, that has very little to do with the music as an art form at all.