Impossible is such a strong word. What if we wrote an AI script that could write AI scripts? Or even better, an AI script that could write AI scripts that could write AI scripts?First I want to tell you that it is impossible to make ai script that would still be interesting
To quote famous chess guy Boris Spassky, the advantage people have over machines is balls and cunning (I'm paraphrasing here!). This was just before a chess-playing computer kicked his ass.
But Boris is right. He was just playing the wrong game. Chess is a game of perfect information - at any given time, you can see the complete state of the game. Games like this are 'easy' - if you are a supercomputer - because you can look at all the possible possibilities.
Warzone is not like chess. You have some information (hey, that guy is shooting at me!), but you do not necessarily know other interesting things like where and how strong the rest of your opponents forces are. This makes it hard to plan and predict the future. It also makes the game interesting and surprising. Simply put, humans are much better at dealing with surprises than machines.
Bottom line: AI is hard. Good AI is even harder. And that is why AI designers cheat.
(note that we are simply talking about the theoretical problem of AI and have not mentioned the challenges of WZ's scripting langauge)