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> They'll almost certainly still be able to block open mail relays

On what grounds? Open mail relays certainly get abused, but there's nothing inherently illegal about them or the traffic they serve.

I expect an explicit allowance for this, because that's the easy way out and there really isn't the political will for anything else.

Increase spam in general by misconfigured mail servers getting hacked and IPs getting blacklisted.

It seems like NAT would be a blatant example of blocking access to legal content, applications, services, or non-harmful devices.

IPv6 exists and works, and if we're going to expect our ISPs to get with the times we should be prepared to do so ourselves. NAT for IPv4 is ultimately unavoidable and thus excusable, but that doesn't mean that they can't use it to make the transition to IPv6 rougher on people who still need IPv4.

Upstream speeds vs downstream speeds will still likely be governed by the laws of economics