All I know is:
I will pay for a decent SIZE (I'm more than happy with basic SSD speeds for most things) SSD, even if it comes in a 3.5" form factor.
The ones I have are literally tiny aluminium boxes (not even sealed, just pop them open) with - inside them - a couple of chips on a PCB that take up about 1/3rd of a 2.5" drive space.
I would buy them by the hundreds, put them in every client, for a "free" speed upgrade. But the capacity is too small at the moment.
Servers, etc. - that's a specialist area. Literally, who cares what they use because you replace it and they are already stupendously fast and bottleneck on network, etc. in most installs rather than the drives themselves.
But I would pay through the nose for a decent capacity hard-drive-replacement SSD that was even, say, 500MB/s read/write. It would be like upgrading every machine in the place to double-speed. I know, I've done it one some of our kit with the cheapiest of cheap SATA SSDs with tiny capacities. The only problem - capacities. You also have a guaranteed replacement revenue stream five years from now if SSD lifetimes really are that limited (to be honest - I replace every machine every four years anyway, drive and all, so I really don't care).
What I hate is that ALL I want is capacity, and all people want to sell me is EVEN MORE SPEED on interfaces I don't have (NVMe etc.), in tinier and tinier formats that - collectively - could give me a 20Tb drive in a 2.5" configuration no problem, even with current tech. I really don't care about that.
NAND, SMAND, CAND, I couldn't care less. 500MB read/write. In a standard SATA format. 5-year lifetime is fine. BUT AT LEAST 1TB. At some vaguely reasonable price I would literally buy them by the dozens of hundreds. Use cheap chips, tons of them, with over-provision and error-correction so I get 1TB of usable space for 5-years. I really don't care.
But the focus on fancy interfaces, faster interconnects, more "standards", and still no improvement in price/capacity when my SATA SSD is basically a half-empty box, and the only thing that SSDs don't have is capacity is really annoying.
To be honest, make them cheap and shit and I'll just keep replacing. The speed upgrade of just maxing out a basic SATA bus is more than worth the effort. And personally, for every server drive I have, there are dozens of client drives that I could be replacing which would make a much bigger difference to the en-user.
Lose your market when it goes cheap? No. I'll start snapping them up in bulk. At the moment, about 128Gb per client is all I can run to and that's barely adequate for modern usage.