I think the price of HQ food is going to rise since serious raiders will want the maximum effect. This will be offset by how much you have to actually use though. Most pro groups can clear turns 1-4 in an hour so they won't have to use more than 2 food per night for that duration. Most serious crafters have the ability to HQ 100% of the time so you're probably not going to see as much high end NQ food entering the market after the patch.