Reading here about the issues with Oga's Cantina, and potential crowds overall, I really feel for the imagineers.
The good thing about opening a new "planet" area is that they weren't as restricted in size of things, compared to what Universal ran into with JK Rowling and the Harry Potter stuff. Having said that, without seeing it in person, it seems maybe the Cantina could have been expanded a bit in a different way. What I mean is, having the main bar area where you can go up, order your drinks and then go to another area that's like the bar, but is more wide open where you can relax and enjoy them.
Like Craig said on this week's DIS Unplugged show, there's always a learning curve and you don't always know what guests will flock to and at what times. It seems they're also having issues with the blue/green milk reviews from various places.