The iron laws of commodity trading are supply and demand curves.
A non existent supply curve basically never exists. There is almost always a price with which one can acquire a commodity or bring in supply. As you stated in the helium case, prices may need to rise for increased supply to come on absent new technology.
Side note: Whale oil is about the only “useful” commodity I can think of that was almost eliminated entirely. Whales were basically saved by the oil and coal industries as lamps moved from whale oil, to kero, and eventually incandescent light. Ironically these industries now threaten sea life through pollution and global warming, but they were initially a saviour of the whales.
Also, AFAIR, synthetic lubricants.
Interestingly, the exact same story has played out in oil. Easy to access conventional fields in politically stable countries was first drained, then producers had to go further and deeper offshore, and into politically unstable countries for supply.
Once again a “magic bullet” of technological development saved the day. Fracking replenished stable supplies and pushed a supply shortage out significantly, buying us some time to transition to cleaner energy. It is important to not squander this time that we were once again lucky to come into at the right time or we could face a massive economic disruption as large fracking fields like the Permian are drained over the next 15-30 years.
We can only get lucky so many times.
I’ve worked in energy trading (oil, gas, power) my whole career. If anyone has any questions on commodities trading, risk, business development, or quantitative analysis in the commodities trading field, feel free to reach out.