This puts the timeline to about 2029-2035.
[0] https://www.scientificamerican.com/article/what-is-the-memor...
The trick of the human brain is that the "processing power" is enmeshed into the "memory", so the brain must have a colossal computational bandwidth, even with pretty slow neurons. I suppose that bandwidth is larger than that of most modern GPU / TPU clusters, which also don't feature anything comparable to 2.5Pb or RAM in their disposal.
The revolution should be mostly in the architecture, much like the deep learning evolution was enabled by GPUs.
Even with your numbers, that's a 6.4x decrease in price per TB (($100/1Tb) / ($250/16TB)), which is around 2.7 halvings over the course of 10 years, which is very close to my "2-3 years per halving" statement.
Even if it's slower than a halving in price per 2-3 years, 4-5 years say, this only delays my prediction by a decade or so.
Feasibility is great but economic access is the aspect that I'm focusing on.