Does it really matter? I mean you can’t be faster than light, wich is around 300km/ms which we pretty much are. I see this more as a bandwidth type of improvement. In theory we could do 65ms around half the globe with a diffct fiber connection and about 900 trillion watts of energy but thats not really the use case I think.
A better improvement would be WiFi and 5g stability and latency. I loose more latency over WiFi than over my entire connection to any server I need.