I think it depends on how seriously Veronica takes her father's legacy..So far we know (in Veronica's own words) that Gambit is not too important to her (whatever that means), but that phrase alone certainly can't reveal how much she doesn't care about Gambit and whether she's willing to break Alexander's genetic line, allowing Angelica to become the mother of the future heir of the empire.
We have a sheet with Dom Kane's possible romances, showing the different World States and the combinations of possible LIs for those states. This sheet was published by Tess up to the point where she heeded our wishes and moved Angelica from T2 to T1.
However, based on this information and assuming that Angelica T1 will remain in the same position (i.e. "solo romance" in WS A), it could mean that there could theoretically be a state where DKane would rule with a strong-willed but obedient wife Angelica, and all other contenders for the role of the heir's mother would be eliminated/unable to claim their share of power in one way or another. Thus, Alexander's lineage is interrupted, and the bastard heir of the empire is born by Angelica of "non-blue blood".
Ofc, there may be the option you write about - DKane and Angelica have the power, but formally there is one "winning" sister Karlsson, who will probably become the one who will give birth to the heir to the empire, but she will be under the power of DKane and Angelica (imo). Personally, I would have preferred that in the finale, Dom Kane, who got all the power, would have had two obedient wives, Olivia and Angelica, and Liv would have been the mother of the future heir.
