I don't think previosu NMs can be solo/duo/trio, but I agree about 8 man-able, since I have witness it before with my eyes on Great Buffalo/ Urakeus/ Dodore. (never try 8 on Goblin and Aldgoat)

I thought they would make NM become more challenge once they reduce party of 15 into 8. but now, it seem that they nerfed them badly, and I think they need to bring more challenge NM into the place soon. The kind of NMs that you can't sleep while fighting it....