There are a couple biotech companies working on less resistant drugs for Aspergillosis (such as Scynexis and Cidara Therapeutics). That being said, they're just in trials, and probably 2-4 years from commercialization.
How long till it ends up in the gardening section of lowes?
If it's specific to Aspergillis, maybe never? The article says that farmers only really want antifungals that prevent plant diseases -- Aspergillis is an "accidental bystander".