Well the problem there is that it's a theoretical upper bound, which is another way of saying "we have not yet found a specific reason that 3.5 inch 60TB drives should be impossible with this technology". That is a far cry from "on their way".
So now, a top of the line Xeon is faster, has 10 multi-threaded cores, includes AES acceleration, and uses 20% less power than it's predecessor 3 years ago... thanks to that base technology.
If you're running a business that generates/consumes alot of storage, this announcement means that you need to start thinking about how to deal with a petabyte of storage capacity with performance characteristics similar to what you have today. (for 1/30th capacity)
Today you can fit about 96T into 4U if you squeeze a little. That's 48 spindles then, sharing the load.
With 60T drives that turns into 2.8P on the same 48 spindles.
At today's maximum SAS bus-speeds (roughly 10 GBit/s) it would take 33 days just to write such an array full (assuming all components can sustain that throughput).
And let's not get started on IOPS...
Anyway, it will be a while before 60T drives hit the shelves. Until then at least the bus-speed issues will probably be sorted out.