Jess, if you need to support more than 32k devices, you simply cluster more controllers together. You can put together qty6 7240 controller which could support 6,000 APs and up to 96,000 users with full 1:1 redundancy, or 10,000 APs and up to 160,000 users with N+1 redundancy, etc.
AirWave can monitor and manage them all. Airwave supports deployments of 4,000 APs per server and you can cluster servers together to monitor up to 100,000 APs with the AIrWave Master Console.
For a deployment this large, you would want to sync up with your local sales team and qualified partners who are trained in dpeloyments this large.