The answer on this is just going to be a personal choice, for sure. I find that in general, younger people (I believe worldwide, not just in the U.S.) are less prone to have an unmanageable lot of possessions...it is true, I often look at my hobby purchases over my six decades (pens, watches, clothes, music) and wish there was less of it to maintain/catalog/rotate... thoiugh I do still mostly enjoy my choices.
I can imagine someone only having streaming and ripped music and getting along just fine. I'm too deep in at this point...just trying not to add a lot to the piles
I do think streaming will get a bit more expensive over time...look at what's happening with the video streaming services...for quality and low inserted advertising, they will keep notching it up. Not to the point it will deter many, but I think it's shortsighted to think that those costs aren't going to keep going up. "Now, which one of you is Pink?" Remember my friends, welcome to the machine...