Between the electronic countermeasures and the nuke-tipped cruise missiles, a B-52 is very difficult to defend against.
I'm pretty sure that the W-80 equipped Tomahawks are long gone from the bomber fleet, shelved during the first Bush administration. The military retains the option to re-deploy them if the need arises, but AFAIK only submarines carry the Tomahawk-N these days. I suspect the warheads will be coming up on their retirement dates in a few years (and we ain't building no mo'.)