Films are a different beast altogether. There's a hell of a lot more data & content in a game. Especially in terms of size, i.e. we've seen how the jump between generations in 2013 made game go from anywhere between 5gb & 15gb on last gen up to the current 40gb+ (often far more, especially for the 'open worlds'). All at just 1080p (& often lower). So good luck streaming a 4K video game (because that's the base resolution of the next gen).
It's a far distant future to the point of being a Utopian science-fiction fantasy at this point.
Actually this doesn't really change anything, the resolution of the display itself does, yes, but the game data not really, since it's just a video feed, if you want a clear perfect picture of a game in motion in 1080p, the bitrate would need to be crazy high in both situation, without being related to the game's data itself, because it's just a video. Actually, streaming a very fast paced game like Bayonetta that is only 10gb would need a more stable high bitrate than something slower paced like Red Dead Redemption 2 that is over 100gb, it's really just a video.
However you are right that movies and games are a totally different thing, I don't even understand how can people say things like "people said that for movies... and look where we are now with netflix and such" but NO, this is different, movies never involved interaction, it's a passive media already pre encoded, movies have always been a video, you are not changing the nature of the media with streaming, you are just changing the way it's distributed, in fact, if they really wanted to they could actually stream movies with the same quality as a phsyical bluray, but that would never happen.
It's totally different for games where in the situation of cloud gaming you are actually totally transforming the nature of the media, turning a real time 3D scene feedback that can be altered with your actions, into a VIDEO. It's really not comparable and people need to stop saying that cloud gaming can be a thing just because movies succeeded (and I actually don't really agree, streaming often offer terrible bitrate compared to blurays) the change from local data to streaming, if people really want to make that comparison, the only fair and comparable one is the digital distribution for games instead of physical, but not streaming.
I don't even understand how can some people just accept this, this could be ruining gaming in so many aspects, for preservation of course but also quality wise, streaming is really not on the same quality standards as something directly rendered locally on your machine, video games always had that special thing about being rendered in real time, a media without any compression compared to videos, a crystal clear image always in real time, but somehow some people are fine with losing that and turning this into a compressed video with blocking, artifacts and latency.
It kills me how so many people are fine with sacrificing quality just for convenience and laziness.