This won't necessarily have the effect of making the remaining Helium last longer: http://en.wikipedia.org/wiki/Jevons_paradox

I do agree with you that worrying about the resource needs of society 500 years from now is unlikely to prove useful. Furthermore, it strikes me a bit odd that the lives of humans hundreds or thousands of years after we are dead is of such great importance to everyone. Unfortunately, this article seems to be discussing running out of Helium in our lifetimes, which probably is something we need to think about.