Perplexed, I'm not sure that choosing any one medium is a way of trying to build a "future-proof" collection of music. At the risk of seeming to be rooted firmly in the Middle Ages, I have to look at my own experience with collecting music. I began in the late '50s (that's 1950s!) by piling up lots of 45 singles; then moved on to lots of 33 albums and reel-to-reel tapes; then fell hard for 8-track tapes & players; backed off and moved to cassette tapes; went through a phase with all of 'em mixed together; then "heard the future" - in the form of the CD - and put almost all my eggs in that basket. Now, of course, Chicken Little is emerging for his annual spring song about "The Death of CDs," so I'm pestered by a few doubts about my past decisions and present choices. But, given how rapidly the rates of technological innovation and modes of delivering audio performances are accelerating, I'm happy to just sort of tread water and try to stay happily afloat until I'm forced to swim toward some (now distant) shore because I can't locate any more CDs and/or any way to repair or replace my latest CD players.
I guess this is a long way of saying, "Worry less about having your 'music list' captured in a future-proof format - and spend more time, RIGHT NOW, listening to and enjoying the music on that list." The only way to be absolutely "future-proof" is to be dead! Thirty years from now, if I'm not dead, I might still be listening happily to my CDs . . . or I might be experiencing musical performances - with all my senses, as if I were there - streamed directly into my brain via a nano-chip implanted in my skull (in a nifty 1--minute outpatient procedure) for just $9.99 at the local clinic of WaltonWorld Enterprises, Inc. . . . or I might just be humming the melodies of my favorite songs, as best I can remember and render them, as I scrounge for firewood to boil some water and make my once-a-week meal of post-nuclear-holocaust squirrel!
Keep listening and keep smilin'!