I wonder how long it will take to have 15 TB consumer PCIe 5 M.2 SSDs at under 1000 dollars for desktop builds? That will end the days of RAID and will help photographers like me who want to put it all on 1 SSD and back it up to another one just like it. These 8TB SSDs are much cheaper now but I need it to be 12 to 15....
That will probably take some time, as there doesn't seem to be much of such specific demand (and mass production is quite a factor in bringing down the price of something).
There is general demand for storage.
In 2022, the SSD market was some $29 billion, with around 300 million client SSDs having been shipped. But an average price of $82.39 per unit, that was around the price of 1TB (for the cheaper ones). In particular, the Steam survey of last month says that 51.41% of users had a total hard drive space of above 1 TB - which means about half of millions of Steam users, have 1 TB storage capacity at most, and of the other ones, likely many are having HDDs.
And meanwhile, the market for MicroSDs was nearly $6 billion, despite them having even less storage capacity than most laptops.
Also, the cloud storage market was some $90 billion in 2022.
So, I wouldn't expect "15 TB consumer PCIe 5 M.2 SSDs at under $1000 for desktop builds" soon, as this particular trend doesn't seem to be there. That may change of course - such as when game devs start utilizing NVMe SSDs more, and users upgrade their systems, switching to any NVMe to begin with, and so on. But as is, it may be worth considering a different approach, depending on whether your need for speedy high storage has to do with loading a lot of files all at once, and/or with the backup part.