>>>No, because you wouldn't configure 15,000 locations as hub sites. At that scale, you would probably have some core hubs, some regional hubs, and the rest would be spokes connecting to their regional hubs.<<< But if there are already 20 non-Meraki VPN Concentrators up and running in the data center which currently link up all 15,000 non-Meraki VPN locations. And you wanted to roll out Meraki MX65's over a 3 year period of time to all of those locations, the VPN Concentrators would still be a non-Meraki device and as such, you could not configure them as a Spoke because only Hubs can be selected with non-Meraki devices.
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