This promo is really pathetic... I was just doing some test bookings and nothing is cost effective for mileage running. Thus, I won't buy any tickets for myself resulting in a net zero pickup in revenue for DL/NW from me personally. My work travel typically books into DL K or Y (both eligible fare classes), so I will probably pick up a few extra EQMs as a result. That being said, DL or NW was going to get that business anyway, so again a net zero pick up in revenue.
As another posted said this is half-hearted match... the grass is greener over at CO.