I like this idea a lot, for three reasons. It promotes Hive and gives it "real world" applications. It can tie in with some of the Hive Dapps which run payments etc (it's a shame Distriator seems to have fallen by the wayside). It is a more useful thing to do with DHF funds.
But now I'm going to play Devil's Advocate. How do we assess the potential businesses ? Hive is notorious for it's user's total blindness to normal business practices, and relying on votes by people who have no idea what a business case is or how to read a P&L is a scary idea. How do we identify and weed out those who just want to rip capital from the DHF and then disappear without trace ? What happens if we fund a business which does it's best but still fails though no fault of their own ? How do we stop the whales from just prioritising their own mates at the expense of ordinary Hivers ?
My first thought was to have smart contracts enabling collateral to be placed in escrow accounts. But if someone has an asset like that, why can't they just liquidate it and use that to fund the business ? For smaller investments, I can see the benefits of a smart contract that enables the DHF to lock in someone's HP or HBD savings so they can't be moved out of HIVE while the debt is still outstanding (but can still use the HP for curation etc).
So overall, I really like this idea, but we'd need to find solutions to ensure it is operated fairly, with low risk to Hive funds and with safeguards against bad actors who'd inevitably see it as a source of free money to take.