[asd]

Sure. Are they still going to be the relevant useful standards 40-50 years from now? Will software/hardware for working with them still be readily available?

Well, my computer can still decode wav files, and that format is close to 25 years old now. What does it matter if the standards now aren't "useful" standards in the future? Why would projects such as VLC (which plays pretty much every format that has ever been created), etc. go away?