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This new 40TB hard drive from Seagate is just the beginning—50TB is coming fast!
(www.techradar.com)
This is a most excellent place for technology news and articles.
You'd still put the 40TB drives in a raid? But eventually you'll be limited by the number of bays, so larger size is better.
Of course, because you don't want to lose the data if one of the drives dies. And backing up that much data is painful.
depends on a lot of factors. If you only need ~30TB of storage and two spare RAID disks, 3x 40TB disks will be much more costly than 6x 10TB disks, or even 4x 20TB disks.