Realistically, all the other fundamental problems of blimps will limit before the helium supply does — remember that it was artificially crippled by the selloff

Realistically, all the other fundamental problems of blimps will limit before the helium supply does — remember that it was artificially crippled by the selloff of the US's strategic helium reserve; it was sold under market value and so all the natural gas producers who could have trapped and sold off their helium production just gave up on doing so. Supply will stabilize again after the last of the reserve is sold off this month.