I have not seen a consumer SSD of 10 or more TB for sale anywhere and absolutely not 20. So the answer is, I have no idea.

Samsung has started selling 8TB drives for around 500-600 which is really not that bad, but I'm just gonna wait a couple years for larger capacities to hit the market and skip 8. It's in my opinion kind of a middling size if you're archiving a lot of video.

For now I'll just stick with the high capacity HDD setup I'm using.