That's a deeply unrealistic scenario. Many NATO members resent U.S. dominance within the alliance, but that doesn't mean they ever intend to eject the United States from the North Atlantic Treaty Organization. They know full well that they need us. So it would be -- and is already, really -- with the Romulan Star Empire and the Typhon Pact. The RSE needs the Pact, sure -- but the Pact needs the RSE even more. The Pact ceases to be a credible counterweight to the Federation and its allies without the Romulans. I don't think the Tzenkethi have a problem with letting the RSE take leadership in the Pact. That sort of "soft power" on Ki Baratan's part is acceptable to them. Hell, why shouldn't it be? It means that Romulus bears the biggest bulls-eye instead of Ab-Tzenketh. Their goal isn't to prevent Romulus from being the most powerful Typhon Pact world. Their goal was to prevent out-and-out domination.