No, the battlewagons are hopelessly obsolete. This railgun requires enormous amounts of power to operate, and any “platform” which mounts it will have to have a totally integrated power system to feed it energy. The DDX was supposed to be that platform, but it is now history.
So are the M-2 and the 1911A1, they just happen to be superior to anything that has been suggested as a replacement. The advantage of the Iowa hulls is that they actually exist