I had wondered about that. B6's issues are related to downgauging flights by around 50 seats. As the article notes, an overbook of 3-5 seats might easily be handled. You might well be able to fish out ten seats with some aggressive offers. Trying to fish out more than 10-15% of a flight (probably 20-25% in the case of B6), however, is likely to be tricky even in the best of cases even with absurd voucher offers.

I think you might still retain IDB (requiring better VDB offers in line with the length of delay as well as adjusting compensation for the IDB accordingly), but I do agree with resurrecting some form of Rule 240. We're back to the "24 hour delay" problem with this and I don't think it's unreasonable to require the option of "other carrier" transportation.

I'll just throw out an example: Let's say that for some reason this was an ORD-EWR flight instead, but everything else remains the same (with an adjustment to the length of the flight, of course). At that point, "other carrier" transport on Amtrak would be faster than waiting out the delay (and you'd be more than able to make the Lake Shore Limited, too...that doesn't depart until 2130). The same general fact pattern would apply to a slew of other destinations (Cleveland, Detroit, St. Louis, Buffalo, Memphis, and New Orleans). If you're willing to just bite the bullet on Greyhound the list grows.

I think restricting restrictions on vouchers would be another thing to consider. Require that VDB vouchers be "same as cash" with the airline (I think I mentioned this elsewhere), including the ability to use more than one on a reservation and/or partially use them on a reservation. I'd also strip away the requirement that the person issued the voucher be on the reservation, though I would be willing to allow them to require that if they weren't on said reservation then they need to, at some point, be physically present and present ID to redeem for someone else or to transfer ownership (e.g. I'd need to head over to my local airport within some timeframe to confirm it). I do get the fraud concern there, but if the voucher were essentially an unrestricted negotiable instrument (aside from only being valid with the airline) then UA would probably have had takers at $800 since I think someone on here would happily have bought that unrestricted $800 voucher for $600.