During the Nixon impeachment era, there were lot of talks like "end of democracy", "shame to USA" etc. History has shown that Nixon crisis actually is the pride of democracy as nobody was above the law, even the POTUS.
I agree with you that China is not the biggest issue that ROC has to face. Officially ROC and Mainland are at war. However, I doubt that Mainland would start a war unless pushed to the extreme.
The biggest issue facing ROC is the extreme corruption. Moses claimed that he was corrupt in order to bring down KMT. Rabbit looted billion. Veggie allegedly looted ~$10M. Hsiao encroached on public property using his power. Still, they almost defeated Horse.