> Does the future possibility degrade today's product?
In some cases, yes. I specifically don't use Spotify in part because I can possibly lose access to my playlists and music I listen to in the future. Building a music collection is a big part of listening to music for me, so the future possibilities of the service actually degrade todays product.
I don't watch streams so I don't have any input on Twitch, but I could imagine someone having a similar outlook.