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Basically, helium in cargo airships will be not a thing.... really...
Zeppelin airships (not to be confused with the Zeppelin Vineyards and Zeppelin University, all 3 based in Friedrichschafen), have to use Helium, and the way the design is, is that the structure is highly limited, thanks to the fact that the helium needs to be contained better. Unlike hydrogen, which could be easily generated from chemical reactions, and was much easier to contain in an airship, helium will slowly leave the inflated part, creating a situation whereby the ballon part will deflate.
Helium is also a Noble Gas, and as such is incredibly rare to find, and would need to be filtered from the atmosphere. There are no economic chemical reactions that could generate it.
That said, helium airships are a thing, but aren't really used for much more than a slow, low altitude business aircraft. They're more frequently hired out by companies wanting aerial photographs but need something that's cheaper than a helicopter, and has the endurance to actually stay in the air for a long time, like the Zeppelin NT.
