I would propose a mix of both. The Capital's should stay, but having the zone system returned would be awesome. For the larger maps, like Compello, Trinity, the one with 12 bases, 6 afs and 6 vbs arranged in a circle-ish pattern (yes, I forgot it's name), and the one that has a ton of cvs (yes, I forgot it's name too), both separated strats, like we use to have, WITH the Capital back near HQ would be awesome. For the smaller maps, just having the separated strats like in the past I think could be a better option. The other thing I want to add to this though is, including the industrial capacity of the enemy nations into the win the war requirements would place a much needed usefulness outside of just "milk running". This would definitely cause fighting across more areas of the maps and the smaller ones may stay up longer as well.
But, I would also like to see an increase to target types we can hit as well. Railyards that cause an increase in time it would take for auto-supplies to be delivered to fields and HiTech's earlier idea of adding concrete factories that increase the down time of towns. Krusty put out an idea about the railyards that have them do a 10% increase in time for when a railyard for a zone was reduced to below 5% (or did you say 0%?) or less. HiTech's concrete factory idea would likely mean that towns would have a down time of probably 20mins, with that increasing as the concrete factory of a zone takes damage to a full 45mins when below a critical level. Mind you, that's only a guess.
The final bit to this though is, increasing the rewards for hitting the Industrial Center of a Capital. The outlying strats feel fine the way the are but the industrial center gives VERY LITTLE in terms of reward for hitting something that is absolutely critical for the other strats. All I ask on that part is that the reward for hitting it be increased to what the outlying strats give at the very least.