The lower power consumption is useful but HBM2 right now come at a very very high cost. Overall smaller package is useful for SFF cards like the fury nano but I am not sure if the market is big enough to justify 300+ dollars more just for SFF version.
I think maybe we will see a 3/4 stack version on consumer if HBM2 comes to consumer soon. Honestly, you dont need that much bandwidth for just gaming. Other pro applications, maybe.