There's no such thing as a blue water autonomous torpedo, there will always need to be a human-occupied platform to project power and manage military naval operations from.
This is without getting into the obvious problems of "lol how do you plan to control your USV? Pacific ocean spanning tether?"
As long as there are blue water navies, there will be military shipyards servicing them.
Looks like Boeing is finally delivering an "Orca" prototype XtraLargeUUV (85 t, 26 m) - more sub than torpedo. Seems to be pier deployment with 6k nm diesel/electric range.[1]
