Never say never! My first hard drive had just 40 MB (4x10^6 bytes) and now Seagate has built 60TB (60x10^12 bytes) SSD. Youtube in 2012 was estimated 80 petabytes, it is about 1400 such hard-drives. Let's say you will have every data replicated 4times in the network (of course you will not be able to have full youtube on each node) . Then you will need 5600 of such a disks to provide 2012 youtube content. Everything is possible. Considering there is million of nodes, everyone providing just about 1TB would be 1 exabyte and and that could store 2012 youtube 12x. Or more realistically, there could be 1000 high-capacity nodes each with 1000 TB (1PB). Considering a better compression and some limitation (assuming 4k will not be supported at the beginning) it's pretty achievable IMHO. Of course it must make sense from economy PoV.
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