I know this isn't a new wish and I'm guilty of not doing much of a search to see/know what was discussed before or other history.
I think it would be interesting to have destructible bridges and dams. Bridges across large rivers or bays in spots where destroying them makes a difference. Not sure how a dam being up or own could be factored in as far as consequences, but it would be fun to have them and try to kill and defend them if we had a reason to.
I realize this is probably something that would be hard to drop into existing maps, but since some new terrain stuff is happening, maybe some future maps could incorporate it.