Ok, maybe we're looking at this wrong. Let's take this for what it is, a story. And in a story, actions have consequences. So even if this is "realistic", this story would have benefited with a reaction that was not as muted and tempered as the one they portrayed. It would have been better if there was a fight for power, however small it may have been, for two reasons. One, it would have provided the perfect setting for the conversations that followed, such as Bolin and Mako splitting on what is right and two, it would have riled the 'Earth Empire' towards Kuvira; seeing her fight against loyalists to an outdated system and an unworthy ruler as well as a foreign government partaking in a sovereign nation's politics. It would have added emotion, energy, and empathy towards Kuvira that is very much needed. Because as of now, Kuvira is completely one-sided. We have seen her pray on her own people, so it would have been significant if she fought for them in front of the eyes of the world.
It would have also put more urgency into Korra's recovery and the Metal's City response. Plot lines would have the necessary weight to move forward quickly. And lastly, from an entertainment aspect, it would have been interesting!
Again, this is a story. And that is why to me the best moment of the episode was Toph getting to the heart of Korra's issue. You see a plot device that is moving to slowly (e.g. you wish Toph would have just healed her already), while I see a story progressing naturally.