Personally, I don't think UCLASS is going to survive this "opposed budget environment" we've got nowadays. There's just too many technological hurdles to overcome for the dollars required and no real demand from any customers. And remember that the X-47 is just a technology demonstrator - demonstrating that you can fly fixed-wing UAVs off a carrier - not an operational asset.
UAVs are good for persistent ISR. Armed drones are good for armed ISR, because a persistent look satisfies everyone's ROE demands - the guy we're looking for is really in that truck, he's the only one in that truck, that's definitely the right truck, the truck's nowhere near a orphanage, etc etc. So it makes sense for the same "unblinking eye" to have the Hellfire onboard, rather than try to hand the shot off to a manned aircraft, where you'd have to do the whole damned process all over again. One less failure point.
As far as it being a strike or SEAD asset...not gonna happen any time soon, and there's a lot of time, research and money between now and there. We're technologically a looooooooong way from the dogfighting murderbots.