Note that NoScript could easily change their scheme to move further into their island where AdBlock Plus would be forced to invade fully-- it's in no one's interest to escalate before diplomacy has been worked through.
The last thing we need is the light-smattering of gray Firefox addons (who are at worst showing some adsense ads) to be forced to push things deeper into darker areas.
Imagine if this was Symantec and Trend? Microsoft or Apple? Do you really want them to be fighting technically on your machine? In principle, it's just fundamentally bad for us to encourage that kind of behavior. They should use diplomacy, and shine lights in the dark areas before escalating technically.
Yes, NoScript reacted to the escalation fiendishly. I just don't think it was responsible on AdBlock Plus's side to escalate technically on such a minor issue when diplomacy/communication is so much better for everyone.