There is also some uncertainty as to whether someone already with multiple citizenships would be expected to renounce more than one. At least there seems to be no formal way of ensuring this.
Now that renunciation comes after the grant of nationality (without ID no.), it may be possible for someone who has gotten ROC nationality, but not yet renounced, to sue the MOI on the basis of unequal treatment. That is, a certain class of ROC “citizens” is (a) being required to renounce, and (b) not getting their ID no. for a year or so. This arguably violates the constitution (although this is not a new thing). Anyway, I think there would be a case, although not necessarily one that would win in the current political environment.
One aspect that has stuck out for me has been the relative impotence of foreigner advocacy groups like Forward Taiwan. There seems to be no group specifically dedicated to the dual nationality issue, since Forward Taiwan is at least equally interested in a broad range of work-visa reforms, and the other groups deal with other kinds of immigrants. At the risk of seeming ungrateful (and I’m not privy to their inner workings), the FT Facebook page seems to avoid harsh criticism of the MOI etc., and take a more positive “harmonious” tone, which may not be helping here. I wonder if they’ve become too cozy with some of the bureaucrats.
Something that might get attention is a public letter-writting campaign aimed at US officials, demanding that Taiwan citizens not be allowed into the USA in case of war unless they can demonstrate professional-level basketball skills, or have 50 years experience spreading Confucianism among the Indians (to steal McCandless’s example). The objective would be to attract local media attention, not to change the US system.