People will be wanting to write much less than 1TB at a time.
If 1 nano - the current minimum amount - would pay for 1TB we’ll need another 3 powers of 10 behind that so a pico so that people can write just 1MB at a time in a single transaction.
And I would dispute that 1TB is the new free. Good luck going into PCWorld and asking for your free 1TB drive! Or expecting 1TB free storage in AWS.
1TB is still a sizable amount of storage. But my main point is that people will want to write much smaller amounts in a single transaction.