that's what I thought as well. eg the fact, that btc have solely an abstract mathematical/cryptographical value instead of any tangible value like any common raw material is actually one of the inventive advantages and not a downside. the author of the article clearly didn't understand the vision of creating a common standard value valid throughout the universe, entirely indepedent of place and materia. maybe the current exchange rates are a bit overpriced compared to the pile of difficulties the btc network is going through right now. but all the arguments in the article are plain old and apply to any other currency as well. If there'd be any flaw in the mathematical structure of btc I'd be scared but not of that kind of tunnel vision.