If you do further research you will find that what is running out is a very specific federal stockpile that has been artificially deflating (heh) prices since the age of airships, in fact your article doesn't actually say that theres an inability to produce more, just that at present only 3 states sell it but other major states are considering starting production. Once its depleted we won't run out of helium, we'll just start extracting it from the Earth again. Already colossal quantities of easily capturable helium are let to escape the atmosphere during natural gas extraction and other mining. Helium's role as a common fission product also means the Earth is constantly generating more.