SNIP....
HTC's motivation would not be gameplay balance it would be more accounts.............
If I am reading you correctly, it seems that you are asking for Custom Arenas to be available to those without subscriptions. In addition, you would like to see the option for custom arenas to add AI.
This indeed would be the old H2H on steroids. The additon of the AI, would most likely have to be mission driven. The missions would have to launch at intervals that would consider reasonable time to encounter mission objectives and also return to base.
Yes, I believe this would be popular with non subscription players. Although, I would really like to see something like this, I am afraid that the drive for most subscribers has been getting their names in lights, more so than getting perks. Giving them viable targets to shoot at that move and shoot back, is something the WW1 arena could use.
As far as more accounts, maybe as a source of additional revenue, there could be another subscription priced lower for this feature alone. Buy a boxed version and get 2-6 months free. A full subscription, has access for 1-?? months beyond their full subscription.