Two of my favourite metaphors apply here. One is the complete breakfast approach. Music as a primary revenue source for artists may change in terms of importance, but I think the clever artists and the passionate artists will find ways to build that complete breakfast with their music streaming and music downloads and merch and touring to create that complete breakfast of revenue streams.
In the long run, as long as they're shrewd and savvy about it, they'll probably be fine.
When it comes to the black box of how artists get paid once the royalties are paid to the people who own the rights to their masters or publishing, that's territory that I'm really not qualified to comment on. In my previous role at Universal perhaps a bit more, but the business models that were in place for the sale of music, in terms of the deals that artists have with their labels or publishers, will probably have to evolve somewhat.