That's reasonable, but I think you significantly underestimate how long it will take before these sorts of conversions will become necessary. IPv6 is 20 years o

That's reasonable, but I think you significantly underestimate how long it will take before these sorts of conversions will become necessary. IPv6 is 20 years old. These things take decades not years. In addition, I think you overestimate the difficulty of conversion. Most backend servers run on 10.x.x.x networks and that doesn't need to change. You just need a proxy in front of them that can speak IPv6. Installing a new proxy does not sound like a hard job. It sounds trivial.