Unfortunately, I'm not sure I'm the right person to share more insight. I don't work on the network team but data between data centers flow on our own network. Data between a client's machine (machines on external networks) and machines on our networks has been encrypted for a while. Data at rest on servers has been encrypted.

Before these revelations, the tech community in general didn't expect that we needed to encrypt all traffic flowing on our home/office LANs. Like the rest of the world, these spying revelations have taught us that we need to be much more paranoid than we were earlier and are now encrypting data on our own networks.

As a user of a lot of web services that are deployed on the cloud, I'd actually beseech my fellow tech community to do this too. All and any user data passed between any two servers (even on a backend, internal, local network) needs to encrypted.