I expect attendances to go up. They normally do when a new stadium is built. Yes, its going to be a bit awkward for city centre fans to get to but as Slim says, by the time its built the infrastructure should be in place to make it easier. I can definitely see more people with cars wanting to go to the new stadium, because it will be easier to get to, and to park at. Plenty of time to put some bars/restaurants nearby as well.
Just think its a pity the train line is on the other side of Cove.
But on the whole the announcement is a very positive one. Hope we see the new stadium and AWPR as promised!