This is one of those questions I use to see if sites know how to research a topic. We have proven reserves to last at current consumption rates for 300 years. A little googling leads you to the facts, which is that we have plenty of helium to last a long, long time. A plant is coming online that will provide nearly the entire planets consumption of helium for then next 50 years. And this is just with places where we know we can get helium out of the earth. We put helium in balloons because it is so cheap because of abundance. It is almost as bad as when I hear cries of the "coming phosphorus shortage".