I'm not sure if you realize this... But in Japan, aquarists literally don't have oom for anything BUT Nano Fish. They have been stacking real estate for a while now over there! Nano is not something that the choose... It's ALL that they have! Sucks but it's a fact. Have seen the typical families home? It's like a large bedroom. EVerything is shurnkn down and compacted! It's sad actually that they have to live in such close quarters. but it's normal to them... SO I'm not sure if "Nano" is that up and coming... That's like saying that compact PC's and Laptops are the thing now...
And that couldn't be farther from the truth! You have to analyze the enthusiast market, which is normally a pretty big market in most hobbies.... JMO Though!