Despite the scaling issues BBM has, it also has one open loophole to bypass the queue system. This is very similar to PasswordBox earlier.
The only pre-requisite is that you have an active BBM account, just like with PasswordBox earlier. You enter the email ID for your active BBM ID and then you get the option to create a new BBM ID. Thats it!
Really, it is that simple, provided you have at least one active BBM ID on iOS/Android.