Idoneth Deepkin involved starting a new army, Daughters of khaine can be played using 0 plastic models. The question is where are the chips gonna fall for your stuff?
New stuffs gonna come out, old stuffs gonna go away. It's the sad truth of Sigmar for the forseeable future. It sucks that GW aren't being more transparent about what their vision of AoSs future is, but really the only thing we can do about it is not buy stuff.
Though, if people are honest with themselves moving to narrative only isn't any huge loss. It's not like 99% of the models that aren't going to carry over were relevant anyway.