If you prove we will not see over 10 TB HDDs in mass production in the following 6 years, then you can get some big blockers more sceptical about scaling above 2 or 4 MB. So go ahead.
You said 10-100TB, which implied a tenfold increase in 6 years. This is not likely.
All we have to do is loudly demand 100TB hard drives be available in 6 years.
Obnixious repetitive complaining will force those lazy, stubborn, greedy bastards at Seagate and Western Digital to come up with a solution.
That's how engineering works, right?

How dare those bastards censor us! We will start a new subreddit r/100tbHardDrives and show them what everyone wants. Nevermind that the engineers have told us repeatedly told us they can't make 100TB+ HDD's at this time, WE WANT IT AND WE WANT IT
NOW.
Ever notice that hard drives are only made in big centralized factories? What's up with that elitism? Can't we try a more fair, democratic approach?

That's because today's techno-industrial complex doesn't espouse decentralization as its guiding principle.
Unlike Bitcoin.
What is so difficult about increasing the platter/bit density by a factor of 20 with no trade-offs in terms of price, performance, and MTBF?

I heard Seagate can put out 100TB drives any time they want, but are sensor-shipping them in order to force us to buy more smaller ones!!!11!

As mentioned earlier, Seagate could, if demand existed. Currently, there's no demand for 100TB drives. No demand, no point making them. DCs are fine with hot-swappable disk arrays, makes for much simpler maintenance.
TL;DR: No flying dog houses because low demand, not technological obstacles.