My guess is we've a better chance of getting what we want from CBU3 pushed towards slightly increased ambition than by swapping them wholesale for "fresh eyes", especially given the norms for the modern industry (or other SE teams in particular).

Would I appreciate getting some fresh ideas into CB3, and maybe even seeing a co-director added to XIV? Sure. But I'm not going to trust a random chance changing of the guard over a push in vision among the existing team.