Instead, Divine and Dragon could appear in Divinity 3

. Even with turn based combat that would be interesting game to play.
It takes completely different set of skills to create cool RTS mechanics than to create an RPG so I honestly wouldn't expect much in this regard from Larian

.
RTS its a game that have to evolve and be supported for a veeery long time to become interesting (for SC2 it took like... 6 years to be really up to the point?). Most of the games become dead by then and most companies don't have any idea how to maintain their community. Such community is also completely different than RPG community.