Do people not realize that you can extract helium in the air? Granted current methods are somewhat inefficient, it's totally possible to do with today's technology.
At the same time, lighter gasses have vertical distributions that reach higher up into space, and some helium does get lost as it "boils off" from earth over time.
Sounds line gold mining... I'm sure they'd do it if needed for scientific purposes... or if they discover some health benefits to heliumtalk
If helium prices rise high enough, then yes, we will extract it from the atmosphere. And scientists will be sad because the they won't be able to afford as much of it anymore.