I'd argue we've had those for a while, just by different names: cruise missiles, anti-radiation missiles, smart glide bombs, etc. The SDB II has a 60 nm range w

I'd argue we've had those for a while, just by different names: cruise missiles, anti-radiation missiles, smart glide bombs, etc. The SDB II has a 60 nm range with active terminal homing, including targeting anything that looks like a moving vehicle. Though I wouldn't consider the SDB particularly cheap, at around 200K each. I would certainly agree the these sorts of precision guided weapons are a game changer, though. I don't believe there's been a conflict yet where both sides have these weapons. Such a conflict would get very very bloody.