"Not every embedded use case needs a GPU – unless you play games on your router"
But some kind of parallel processing could be handy. e.g. transcoding video for your shiny new smart TV that doesn't support many(any) formats. My router already supports USB HD and serving files, not a big leap really.
I suppose that's what AMD are trying to get at, no-one would put a graphics card in a router, but including an embedded GPU in the main processor might be handy for other things.