These kind of gigs are definitely nowhere near as common as they once were, but they haven't evaporated completely - I work in emergency services infrastructure

These kind of gigs are definitely nowhere near as common as they once were, but they haven't evaporated completely - I work in emergency services infrastructure in the process of a 10 rack build and that is something I don't see changing in the next 10 years, where we will do a refresh possibly once, or twice more. The complexity in our case is in the backend transmission network and unless we control everything (hardware, network) end-to-end as much as possible, we can't guarantee to getting close meet our SLA's for our customer. They wouldn't allow us to run our system in the cloud even if we wanted to.