So 64 bit address is only 1024 16TB HDDs? That number may go down quickly. There is a 100TB SSD already.
Kilo is 10 bits. Mega 20. Gigs 30. Tera 40. 16TB is 44 bits. 1000* is another 10 bits so 54.
That is still an order of magnitude smaller than 16EiB. So no, not in a few years time.
Frontier's LustreFS based mind-boggling 700PB Orion storage subsystem writes at a similarly impressive 5TB/s [1]; so with a generous reading, it could potentially fill up in about 39h. Historically, disk density increased more rapidly than network bandwidth, which ultimately limits the performance of distributed file systems.
If it takes weeks or months to write such enormous data set, then there will be only few use cases, if it takes years there will be none.
[1] https://www.ornl.gov/news/frontier-supercomputer-debuts-worl...
Oops, that's nonsense. I had my coffee now...