would double our gamers?
well... i dont think so - i dont watch live games and i know that, probably the majority of user's don't watch the games live. so im not sure that this would double our gamers. 
the fact that this is a game thats displayed in a web browser means it has technical limitations on what it can achieve using the current technology out there ie: Flash player etc. 
Currently i dont think this would be possible using this technology. 
That and the game engine doesn't match up to exact passes/dribbling up the court etc. So yer. 
nice idea, but if you want visuals, just go play NBA Live - isnt there a plugin somewhere that allows you to connect your BB team to NBA2k14?