Diamond may have their reasons but like so many other things I think it's popularity and commonality.
People see it on tv and yes the blue looks nice, old fashion people will say different but eventually it came down to (like someone else mentioned) "hey I wish they had the blue cloth on our tables". (in my life, so don't count yours) It was slow to come on since room owners that were not very much into pool didn't know what this "new blue cloth" everyone "which in his mind meant the 3 people that asked him" was talking about. Plus from their stand point "i'm not looking to redo all of my table just cause 2 people ask me too" also "that color is going to get and show dirt and stains like crazy, and i'm not doing 1 cause it's going to look odd".
Eventually as time went on and more and more people we asking about it and a few room owner started looking into it and some gambling on it the chain reaction happened. People began feeling and seeing what they wanted to see and feel. After playing on that old dirty cloth for so long the first this was "WOW this is fast" and then came the "this is nice, i like the color and it makes the place look nice, plus i think you can see the balls better" once again because the previous cloth was so dirty.
This is some what no different to the Predator/Low Deflection revolution that happened and followed by the Kamui insurgence. You had tons of low level players, less experienced players, less knowledgeable players etc buying Predator cues and putting kamui on their budweiser cues, all the while not knowing what deflection was much less how to tell or determine it's behavior based on their playing style and ability.
And so on and so on, you can fill in the blanks from here i guess.