If Adele decides not to put her album on streaming services it will only be about one thing, the money. But even her team can see the lack of wisdom in such a decision, because it would hurt her career. Then again, in music the acts are fungible and no one looks long term and mistakes are made constantly.
Led Zeppelin was on vinyl only. And then 8-track, cassette, CD, file/MP3/AAC and now stream. Did any of these carriers affect how you felt about the band? Of course not. As for being prescient, their manager sold out their royalties believing their catalog wasn't worth anything. Elvis's manager did this too. No one would do such a thing today. Because those in the know realize the money is in longevity.
The only reason to not be on Spotify, et al, is because of the money. If you think any artist can fight the future that is streaming you've got your head up your rear end and don't realize streaming already won. The agitation of acts over payment is a non-story that just keeps people from paying, that keeps them streaming YouTube videos, only in the music business can an industry not embrace a game-changing technology. It would be like computer companies refusing to install Wi-Fi. Microsoft not upgrading Office. Nokia saying the future is flip-phones, and they're gonna keep on making them only.