Let's be honest, even in the public cloud there are very few orgs that can survive regional failures and most people solve locality through CDN's for content delivery which means a private datacenter isn't really that different from public cloud for most orgs. Also, when when orgs move to the cloud they don't fire their networking team, they still have deskopts/laptops/servers/security devices/printers and large lans/wans to connect / peer already and these teams could staff up for private datacenter without really adding additional costs that aren't already incurred as part of doing business anyway. Our private datacenter is a few thousand servers leased space in a colo and we have one "datacenter dude" who handles hardware issues and our network team spends 90% of their time still on corporate infra vs actual supports with colo space. One can take some up front engineering/planning costs to scope out a private datacenter for about the same cost as it is to scope/plan VPC's and peering/connectivity/vpn services.