While I like the idea of attrition and various other ideas (especially the "your army dies, it is practically over" situation), I am absolutely against making TW not turn-based. I really hate real-time campaigns since it happens too fast and even if there is a "snail" speed mode, I still use the pause button to give others and then fast forward the time.
The mix turn-based campaign/rts battles is the very feature that made me a loyal fan of the series. The moment that system goes full real-time would be a sad day for me.
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