Air is 5 ppm helium and 15 ppm neon. Neon lifts balloons too, but we don't use it because it's too expensive to recover from the air, and recovering helium is even more inefficient.
We'll never run out on any timescale that matters, the loss to outer space is only concern over geological time spans.
NOTHING is a concern over geological time periods! The Sun will eventually swallow the Earth- but nobody seems to care too much. Helium depletion on Earth will be a blip on a geological time scale, but during that blip helium will be just a memory to several thousand generations.
Helium is for sissies anyway. I don't care if Donald Trump commutes to work in a blimp refilled with freshly scented helium-3 every morning. MY airship has a pedal-powered generator to pump current through a electrolysis chamber. Hydrogen works so much better than helium anyway... it really gets you high.