DubConqueror: (though I don't understand how they can live with their music collection disappearing when their subscription or the music service ends)
Depends what kind of music it is they "consume" from the streaming service. I can easily see the point of streaming services for people who constantly consume contemporary music (e.g. listening to top ten and not often getting back to years old tunes), and especially if they want to easily have up-to-date list for "party music" in parties, get-togethers etc. For such purposes streaming music services are clearly great.
Same for TV series and movies. If you are the kind of person who just wants to see lots of (mostly new) TV series and movies, and usually not wanting to get back to them later, then streaming services like Netflix, HBO etc. are great.
I personally feel games are mostly a bit different from those, which in itself makes them less suitable for streaming services. It takes max 2 hours to watch a movie or one ½-1 hours for a TV series episode (and then be done for it for good), but usually that is not the case for games. Depending on the game, you might be playing the same game for even weeks or more, even if you kept playing some other games in the meantime as well.
So I'd say in general gamers stick to certain games for much longer periods of time than for e.g. movies or TV episodes, even if they don't tend to replay games several times.
So the gamer equivalent of a Netflix heavy user, who'd "consume" (finish or abandon) several games per week is a rarity. Then that raises the question whether it makes sense to subscribe to such a game streaming service where the whole point was to have access to buttloads of games, if you'll be playing only few of them at a time per month. Would you subscribe to Netflix if you tend to watch only a couple of movies or TV series episodes per month? Or subscribe to Spotify if you tend to listen to new pieces of music only a couple of times per month?
There are of course the other problems for streaming gaming that don't affect music and movies, like input lag, the higher prices (because streaming gaming needs much more CPU/GPU power than video or audio feed, and someone, that is YOU, has to pay for that processing power) etc.
Also, with music and movies/TV series you generally expect to easily find them in competing services, in case you want to get back to them later, like in order to see your favorite movie or listen to Michael Jackson's "Beat it" yet again. With games that is not necessarily true especially with streaming services, you can't count on finding your keeper gems from a competing service, or even from the same service one year later.