I've been woken by the fire department before -- someone knocking on my bedroom door and then bursting in. Scared the crap out of me and I instantly went into attack mode with my new bride sleeping next to me.
I didn't feel the need (or have the sense) to draw as it happened so fast. But if I'd felt that need, it wouldn't have been mitigated by the law of WA state. I mean, I wasn't, wouldn't and don't thing, "Hmmmm, what is the RCW regarding this situation of someone breaking into my home?"
So to me, the law is moot. People would either react that way or they wouldn't. And I doubt it'll change anyone's behavior one way or the other...