Sure, but electric cars used to be insanely expensive too. And while still expensive, they’ve definitely become cheaper with more range. That is to say, lots of things start out being expensive, and then as they get scaled up and the process gets optimized, they become cheaper.
Is there hope for some kind of law for the price steadily decreasing over time as efficiencies improve, like Moore's law for computer chips or the exponential increase of solar efficiency?
They're different things. I could build my own processor fab for probably around €100 000, and those things used to cost millions – but I'm not exploiting economies of scale. Rather, I can look up how to best do it instead of having to work it out myself, plus I have better other technology available (e.g. a laser cutter can be modified to make parts of it).
I'd still have the problem of sourcing materials and disposing of all that toxic waste, though, which probably isn't a problem with the salmon.
If you can build your own processor fab today for €100 000, you are definitely exploiting economies of scale. It is possible because of the massive existing industry that's created the market for, and driven down the price of parts and tools and supplies that you need to put it together and run it. E.g., that inexpensive off the shelf laser cutter you need to buy.
Once it's taken off sometimes there is reference to the the manufacturing s-curve. That would be on the Wikipedia chart, going from when the R&D has traction to where increasing scaling increases volume and reduces costs of the product.
Sure, like with anything that goes into mass production.
But before that happens, the process needs to be understood and not rely on rare ingredients, for which production also needs to scale up.
Are there big suppliers of salmon stemcells?