Science! Just when everyone's having a great time, it comes along and tells us to turn down the music. Or, at the very least, to stop blowing up party balloons with helium, you heathens, because you're ruining some very important experiments.
Thanks to artificially low prices, helium reserves could be entirely depleted in 100 years—jeopardizing the space and nuclear industries, which use the element for crucial components and processes. That squeaky voice isn't so funny anymore, is it?