OMG! Overtext! How long have I been sleeping?! OVERTEXT! Also, I'm a DESIGNER now?! Sweet! OVERTEXXXXXXT!
HO HO HO! Give me some money!
Re:Kingmaker when the deck runs out
Yes, there is certainly the potential for some kingmaking in the endgame if the deck runs out. However, I really don't see it as a problem. As you point out, protecting your domaines with knights or alliances is essential. If you treat your domaines like balloons, just expanding without adding defense, don't be surprised if someone pops one.
Furthermore, if you grew your kingdom by picking on opponents when they were in a significantly weaker position, they have every right to return the favor once they are able.
Considering this is a game about asserting one's right to be king, a little kingmaking is not a bad thing, in my opinion, and adds a mild political angle when deciding whether to expand into unclaimed territory or an opponent's domaine.