Bring some of it to mainline, outsource a smaller number of larger RJs, and possibly cease service to some of the really crappy markets.
I don't think you have a good grasp on what a loss leader is. Let's simplify it to a retailer. Wal Mart has used the loss leader game for decades. They advertise a product at what they know is a 10% loss. Every single one of those widgets is going to lose money when they're sold. But when someone walks into the store to buy that loss leader that has a negative 10% margin, most of them will also buy other products while they're there. So they'll pick up widget B that has a 15% markup, and widget C that has a crazy 50% markup. The product that they advertised at a 10% loss just made them a significant margin because it got someone in the door who bought other products with big margins.
Airlines have always done the same thing. Sell a ticket from LAN to DTW at a loss, but it's ok because many of the passengers filling those seats are connecting to high yield transcon and international flights. The problem today is that the yields from the transcon and international flights are no longer making up the difference in the losses they're taking on those thinner routes. So it's no longer a loss leader, it's just a loser.
Feed doesn't do you any good if you're just feeding more losses into the system. Feed is only useful if it produces a net benefit to the bottom line. And with oil at $80/bbl or more, small RJs are no longer bringing enough revenue, even with the connecting passengers, to offset their high relative costs.
You seem to have missed the fact that unlike in the past, those aircraft orders aren't coming from mainline anymore. In the old days, a mainline carrier would put in the aircraft order, then sublease the airplanes to their regional partners. Mainline carriers aren't doing that very much today. Instead, the mainline carriers are forcing the regional carriers to place their own aircraft orders. So people like Bedford have made huge gambles on buying these large RJs, some of which aren't even allowed by mainline scope clauses. They're gambling that they'll be able to get the business when the aircraft show up on property. It's starting to look like that wasn't such a good gamble. They may end up selling those delivery slots to foreign carriers at a loss.