This is interesting, but is it really as simple as "laptops are now using SSDs over HDDs"? I'd like to see some more detailed analysis of this prediction.
As recently as 2 years ago, Lenovo tried to sell me a laptop with a mechanical HDD. They actually succeeded -- their price for an SSD was insane -- but I ripped it out and replaced it immediately.
Today a mechanical HDD isn't even an option. The new generation of the same machine is offered only with a PCIe SSD.
That's just one point of anecdata, but I think it's a pretty stark one.
I think another factor is that HDD that are included in computers are larger by default. So instead of shipping with a 256GB HDD and forcing the customer to buy another one later, it ships with a 2TB HDD.
