I'm afraid that SNSD will tur out to be like them....it'll be TaeTiSeo fans vs SONES...
It shouldn't have to be, TTS is part of SNSD so it shouldn't be a problem same goes with future subunits/solos. Fans are only creating fanwars/issues within themselves which is not good. This very much occur in the ifandom though because they seem to care more about individual bias rather than group.
Boygroups actually does the same but were still supported by the whole fandom - SJ for example have dozens of sub units & solos ~ their unit aside from album even held tours on their own. You do it in SNSD and fandoms started dividing, wonder why?
TTS received love, Sone should be proud since it's still SNSD, but their antis reside within the same fandom with different biases which is sad. It will only be a cycle once other units emerged which shouldn't be. Kfandom is more together, hope it will also be like that holistically.