For a particular physical media format to go away, there have to be a superior format and a migration path. By the time the iMac came out, other physical media to replace the internal floppy drive were ready, namely Floptical, Zip, and LS-120. Over the next few years, external CD-RW drives and USB flash drives provided other alternatives. USB floppy drives provided a migration path, and even a decade and a half later, I can still buy a USB 3.5" floppy drive. I'll grant that the 5.25" and 8" floppy drives aren't widely available in USB, and USB floppy drives may have trouble reading non-high-density floppies, because unlike with high-density 3.5" floppies, PC manufacturers never could agree on a modulation for those. But it's still possible to skip a few generations at a time when format shifting.
If you're talking about an alternative to using physical media at all as a method of distributing copies of motion pictures to the public, that won't happen until there's a replacement. Both of these need to happen:
- 1. Movies and TV series need to be made available through streaming rental within a few months after they complete their run and stay available for decades.
- 2. Rural areas need home Internet connections with at least 100 GB per month cap, not the 10 GB per month cap that satellite plans tend to have. Customers in these areas tend to buy optical discs to supplement the free-to-air TV that they do get.
I don't see how Disney is likely to agree to #1 given its "vault" practices, and I don't see how #2 will be achieved with the crony capitalism prevalent among United States telcos.