Someone asked me for some ideas about rebooting Warlords 1 (1990) so here they are...
War 1 is super outdated, Warlords 2 and 3 are bit better. Dark Lords Rising seems to be the pinacle of warlords games but still the mechanics have been refined much more in early 2000s games like Age of Wonders, Disciples, Homm etc. I dont see much value in rebooting this stuff.
Maybe a decent way to reboot it can be to have different "Warlords" the player can choose instead of starting nations. For example if a player picks the "cavalary warlord" his mounted units may get better attack and move bonus but weaker infantry and flying units etc.