5G and it's surrounding situations until 2020

Everybody getting excited with the 5G, mixing cats and dogs together. But the reality is, there is physical limitations and no magic, we should cool down. Whereas a lot would get to be possible and that should not be under estimated, and we should know what would be possible and what would not. Industry experts should be able to figure out better images before it actually comes, so as not to make big mistakes. Looking around 5G and it's surrounding technologies, in view of capabilities and physical limitations, I would like to briefly survey situations around forthcoming these years. So far with my experience, I believe I can figure out a little bit better images, and can help a little.