Uh oh, the altcoin wars...
Although that article is correct that there can only be one dominant unit-of-account, it is not true that we don't find utility in other assets, e.g. gold, silver, stocks, options, etc..
The article is correct that no altcoin has yet created a feature set that was differentiated enough to make such a claim.
The article is also loaded with strawmen and incompletely-explored-partial-truths.
The nitty-gritty details matter.