I think his point was that new startups and markets will emerge to help artists with the business side of making music. (Promotion of music, concert/tour management, advertising etc...) They're already starting to appear.
So that may not be much of a lock-in for the big music labels.
I think you should take it as an axiom that if the major labels don't have anything viable that they can lock up, there won't be anything that they stay significant in.
So long as terrestrial radio matters, they can parlay their ownership of that channel into many other offerings.
But one by one, the things that major labels maintain structural advantages in are falling into irrelevance.
One day, and it won't be long from now, the last relevant thing that major labels own will fade into irrelevance. And then all the other things that major labels "do" will be "done" by lots of other companies, more agile companies, companies that focus on just those things. And that'll be the end of the major labels.
This isn't exactly insightful stuff, is it? I feel like you can pull case studies about it from the history of 20th century business.
So that may not be much of a lock-in for the big music labels.