Don't forget DHL have some 300Fs

In fact there are over 300 active 767 freighters

Indeed, Boeing are still building the 767F.

Flew on a Delta one last week ATL-LHR. Fitted with what appeared to be brand new cabin interior.

You might want to think about what the A340 and 747 have in common...
Different operators use different business models. There are some operators who don't do 'D' checks - they get rid of them before that. Others are perfectly happy to do heavy maintenance checks on a regular basis. Put a new/updated interior in a 20 year old aircraft and most SLF won't know the difference between that and a new aircraft.
Heavy maintenance on the 767 (and 757) has proved to be relatively easy and inexpensive, as a result there are some seriously high time passenger 767s still flying for mainline operators.

Long live The Dumpster!!!

Icelandair still flies 767s ... or do you not consider their hub and spoke routes long enough haul?

Let me think hard... 4 holes? range?

Thing is, by the 00s, twins were surpassing four holers in fuel efficiency and range. At the same time, the 777 and 330 had an edge over older designs like the 767.

With the possible exception of freighters, there is little reason for four engines. The only four engine aircraft still in production is the 747-8F, and it's future is pretty cloudy at the moment.
The problem with replacing 767s with A330/777 is size - they are both significantly larger than a 767-300, with the associated higher operational costs. So even with more efficient engines, they cost more to operate, so you need to be able to fill them to make it worthwhile compared to a 767.
There is still a good sized hole between the A321/737-10MAX and the A330 NEO. Which is also why Boeing is looking so hard at the MMA

So yours was a loaded statement, I don't recell Boeing marketing that the type was only for long-haul operations by major carriers, according to Wiki there have been some 1,176 B767's manufactured over the past 39 years and if, as some suggest, more than 700 of these remain in service then I'd say that is a very successful type.

I'd hate to be an airline CEO in this day and age "Oops, we no matter how profitable the route we can't utilise our B767's on short/medium haul in case in years to come some spotter comes along ..."

Indeed so.

BA certainly didn't subscribe to that view. Before they retired the type, they had two dedicated 767 sub-fleets, one used for longhaul and the other for shorthaul (including some UK domestic schedules).

It's not hard to see why this thread, which started in R&N, was relegated by the mods to Spotters' Corner. :O

I know they are selling a lot to freight operators to this day! Excellent aircraft.

Ethiopian still has six -300's chugging around Africa and the Middle East on what may not unreasonably be described as secondary routes, with the 777, 787 and A350's now on the premium runs.

Are the Ethiopian 767s still configured with 8 across in coach? AFAIK they were the only operator to do that.
The 767 was often the most popular aircraft with SLF due to the 7 across coach seating and the relatively roomy seats it provided. I did a per-delivery flight test on on of those Ethiopian 767s a long time ago - I could fit into one of their coach seats but it was tight (and I'm not a large person). Sitting there for several hours would have been horrid...

BY/TOM/TUI were/are 8 abrest in Y.

Yes it was BY in 1984 that first saw 8 abreast in their new 767-200's and BY manged 273Y (then up to 290Y with a galley shift).
Did not seem too bad when I first flew to IBZ on one in summer 84 but I was only young and slim then LOL
There are other airlines around that followed suit - Leisure International and AMM with it's 767-300's to name but 2...Not much fun if going to the Maldives or Orlando....

Monarch started the 9 abreast trend on it's four A300's to enable 361Y (not sure if any of the German carriers had already done this before MON/OM did)

Example visible overhead Northampton now; FR24 shows it to be 763 N677UA off LHR for Newark. Several others, mostly Delta on NA tracks.

TUI still operate type on UK register, G-OBYH currently off Portuguese coast en route MAN-LPA.

Flew LHR-EWR and return on United examples in late 2018.

According to SeatGuru, 7 abreast, 2-3-2. 24pax in Business (2-2-2), 199 Economy