I thought I went over this with you before.
A six-state configuration is not a novelty. In the Japanese era, the entire island was unified for the first time in Formosa history. Geographical considerations eventually resulted in 5+2 provinces : Taihoku, Shinjuku, Taichū, Tainan, and Takao, and the two Eastern regions: Karen Port and Taitō.
In the Chen administration, Vice president Annette Lü has talked about a 6-state configuration, and CSB himself started a conversation of a partnership relationship with the Aboriginal Nations. I have talked to some activists to push toward a Treaty-based relationship instead of a "granted autonomy" that would imply the Aboriginals are subordinate to the roc institution. Long-term political stability (and I mean really long term) is contingent upon the western part of Taiwan reconciles with the Takasago Aboriginals, restoring the the political status of the Takasago to its rightful place.
Former president LTH many times in his speeches talked about a 6-state configuration.
Current Taipei Major Ko himself takes it even further to a 3-state. But I think it's too extreme.
Facts are, the mayors are getting more powerful than ever before. Notably Taipei, Tainan, and Kaohsiung. It it doesn't mean anything to you, then you're just not sensitive enough. Plus it's not just Taiwan. Urbanization makes it this way, globally.
KMT administration itself merged Kahosung, Tainan, and Taichung.
Former DPP presidential candidate Frank Hsieh in 2008 did plan for 5-6 states configuration, each being a size and population roughly equal to a Singapore.
Single-member district is one critical step toward confederacy. But then, democracy itself is confederacy, fundamentally speaking. There is no turning back.
Because of the distributive nature of confederacy, it is extremely difficult for China to annex politically all of Formosa at once.
Metropolitan-level diplomacy will replace traditional useless roc-MOFA. (I'm sure you're aware of it already)
During the 2014 election, there was a minor news that Tsai and Ko had a pact, that Ko would attend DPP's inter-city forum. You don't have to believe that the forum mean anything. But in the forum is the mayors can set their own agenda. No you don't need ROC's approval for such a forum.