I think we may expect more accessible and expressive music, on the whole, being written in this century compared to the last one. But then, a century is a long time and who knows what will happen a decade or two from now.
As regards the music industry, I recently read a series of interviews with nearly a dozen prominent orchestra directors, music scholars, composers etc on the future of major symphony orchestras and they were all pessimistic and thought that the situation was financially unsustainable. Already, the orchestras frequently had to program film and video game musics and pops to lure in the millenials and less classical listeners and some sort of visual projection was becoming common even in symphonic concerts. Still, the halls were half-filled even when the Concertgebouw came to town. Some noticeably said they thought the community orchestras and local a capella societies would have greater survival chances.
Add to this the estimates that only Naxos will be left soon as a classical label, recording and distributing live performances only. However, recorded music will have no commercial value other than promotion, because "money will be made by performing, by donations, by sponsorships and, in some cases, by endorsements".
I can understand these difficulties but I don't believe the classical music is going to lie belly up. Just think of the often reported 50 million students of classical piano and violin in China only and that from a population of 110 average IQ and language-induced perfect pitch.
As regards favorite 21st century music(ians), I'd like to hear what others have to say because I feel I have yet acquainted myself with very little of the pre-21st century music, let alone the 21st century music. Nonetheless, I do stumble on living composers from time to time and I can mention, for instance, A Rubtsov, who I believe has some chamber works in the caliber of Bozza, Koechlin or Françaix.