If your hypervisor infrastructure supports 10G interfaces, you can use them for the VMC.
This sounds to me like a theoretical question as 30 Gbps for max 50 APs/800 clients (for the MC-VA-50) doesn't sound in balance to me. It could be that you are planning to deploy a corner-case scenario, which is good to verify with your local Aruba contacts to avoid that something is overseen in your specific situation.