And in 5-8 years, there will be more powerful equipment available at lower prices for that 5% of infrastructure. And you still have 1100 5-8 year old routers at all your locations that might not be capable of running whatever physical layer link we're using 5-8 years from now.

Future proofing is one thing. This is like buying a 747 for a route that serves a dozen passengers a flight to prepare them for the future.