> The world now runs on HTTPS on top of UDP or TCP on top of IPv6/4, on top of some kind of wire that carries ethernet.
Am I misunderstanding what you mean by "the world" here? Most of the networks I work with are not HTTPS on top of UDP or TCP.
> Grumpy people, clinging to what they know, delaying unavoidable change until the very last moment
This seems unrealistically broad. For all of the things you cite, there are downsides along with upsides. For all of them, we lose something as well as gain something. That means there's a cost (even ignoring the cost of making the change itself) as well as a benefit. That means a cost/benefit calculation takes place, and the results of that calculation are not guaranteed to be in favor of the replacement tech.
Am I misunderstanding what you mean by "the world" here? Most of the networks I work with are not HTTPS on top of UDP or TCP.
> Grumpy people, clinging to what they know, delaying unavoidable change until the very last moment
This seems unrealistically broad. For all of the things you cite, there are downsides along with upsides. For all of them, we lose something as well as gain something. That means there's a cost (even ignoring the cost of making the change itself) as well as a benefit. That means a cost/benefit calculation takes place, and the results of that calculation are not guaranteed to be in favor of the replacement tech.