If I had the money to invest, I'd ensure it was invested in a disk company that also makes flash storage, because diversification is a smart move. Just like having said disk to back up that oh-so-precious chippery that is one controller failure away from total loss. Eggs and basket scenario, you see.
And yes, if I had the cash to do so, why not? I'd look for the right company that is also looking ahead, trying new technologies and seeing if they can squeeze yet more life out of existing tech so we can have greater capacities for less money. Give people the space, they'll use it. Drives break, people upgrade, disks get sold still. If the market is there, then you'd be daft not to cater for it.
Biting the hand that feeds IT
