I'm more annoyed by the fact they haven't said an estimate or something of when Pokemon Bank can come out in the Americas. I think now that Europe and Australia have gotten the Bank, they would be able to give a more accurate estimate than before.
They have to gauge the amount of incoming activity and let it get past a certain threshold.
Think of it like this: there's a scale of 1-10 on whether something will crash. When Bank first launched it was at a 10, so it failed. Let's say there was a 3 in America, 3 in Japan, 3 in Europe and 1 everywhere else in the world, totaling 10.
Rolling out to different regions separately allows these numbers to stay low, and the servers to actually stay up. When they launched in Japan servers went from 0 (because it was shut down) to 3, because everyone in Japan was using their servers, so activity was high. Over time that number went from 3 to 2, and 2 to 1.
Now that the action in Japan has subsided because most people have used Bank, Japan now comes in at a 1 instead of a 3.
This allows the 3 from Europe access, and the total is now 4.
Once Europe comes down and the numbers are at a steady 3 or 4 (1 from Japan, 1 from Europe, 1 from Australia) they can roll out to the US to allow users in the other regions to still have access while taking on our 3+ number.
Nintendo doesn't want another 10 on their servers - if they have to close down Bank again could you imagine the outrage at that rather than making people wait a bit for a steady experience?
It's coming soon!