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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.
It's not inherent in terms of "more store=more fast".
You could absolutely take older, more established production nodes to produce higher quality, longer lasting flash storage. The limitation hardly ever is space, but heat. So putting that kind of flash storage, with intentionally slowed down controllers, into regular 2.5 or even 3.5" form factors should be possible.
Cost could be an issue because the market isn't seen as very large.