The problem is probably in processing and storing the helium indefinitely. We might wish we had the vented helium in 100 years or whatever. But unless it can be

The problem is probably in processing and storing the helium indefinitely. We might wish we had the vented helium in 100 years or whatever. But unless it can be retained until the time it is needed (a fundamentally unprofitable venture to anyone alive now), it can't be used.