Starcraft 2 is less like Starcraft BW than AOEII or especially Age of Mythology. SC2 is a series of arcade-style games, ie. dodge the biles, stutter step micro, ding the mule calldown bell, juggle with the air transport, click through all your creep tumours as fast as possible, etc. etc. etc… Sadly SC2 has very little in connection with SC:BW other than in name.
Instead of any followup to AOM to emulate something like SC2 I would value instead something that simply embraces AOM itself and just improves directly on what it already has.
AOM has really good civilization options -Greek Egyptian Norse Chinese and a “beginner accessible” Atlantean. It can maybe fit +1 mythological civilization in there. AOM has a beautiful simplicity yet with variety in its units where you have a unit types that are shared between civilizations that keep the game familiar and understandable ie. Myth Unit / Hero / Human unit and then Infantry, Archer, Cavalry, etc. but then units unique to each civilization ie. Hoplite vs. Spearman and never redundant ie. there’s just one toxote for the greek archer rather than two or three more different variations of the archer where one is fast but short ranged and the other is tanky and so on. AOM has a couple of balance concern specifics but close to nothing that needs to be ripped out and redone, which is very impressive given its strategic depth and variety. AOM has a couple of incongruent elements; as said, AOM is like AOE2 and SC:BW mixed together, but AOM inherited the formation movement style of AOE2 which was designed with the idea of armies clashing while it favors the more dynamic engagement styles of SC:BW with concepts such as surrounding and picking off individual units, attacking and retreating, etc. and these things don’t really match each other. AOM has a sometimes obtuse way of streamlining macro mechanics that could be streamlined again with better, more modern concepts for example instead of Autoqueue use a multi-building selected accessible smartqueue that looks more like your production tab of your custom UI for your replays. AOM can make several of its core elements just “pop” with some good RTS game craftmanship- hoplites/spearmen that can attack over each other in formations, which appears to be in AOE4, as an example.
Essentially if they just make Age of Mythology a second time you have the ideal AOM2.