You won't break even. Indeed, that's even if you can get the damn wallets to load these days...
Lots of burst fans would probably disagree with you and tell you they've ROI-ed 10 times over on their HDDs. Truth is, yeah, unless you started HDD mininng a year ago or later, you will have a difficult time ROI-ing on your equipment.
I am however confident that proof-of-storage is safe from ASICs. If you think of it, HDDs are already ASICs, they are specific to 1 application, which is storing data. Can't get more simple and direct as that.