I think it's crazy that those of you with 2011s have never had a retina Mac. I can't imagine using a non-retina screen for that many years...
(I can't see the difference between a 13" retina and a 13" cMBP side by side)
But that aside:
Would someone that paid 2500-2700 for a 2011 want to buy a last year 2012 cMBP or the slower first Generation Retina for another 3K a year later? or wait 2 years and see how they were and then see/hear about peeling problems and then buy one?
or, Maybe they have the High Resolution matte displays and thought about getting a retina display but then thought hmmm what I have, won't peel, and isn't bogged down with 4 GB of RAM pretty much dedicated to powering the retina...and since I use an external display most of the time as well, what's the point when I do most of my work on the larger display...
I've survived 63 years without an Apple retina display (hell I can see and measure the 1/8" pixels on my 60lb tube TV with a tape measure, from 5 feet away) so, I, hope to miss it, and its inherent problems and resource robbing demands, completely.
I'm using a 13" cMBP that is 6 years old and I also have a 10 year old Black MacBook I use right next to it...Are those retinas going to last this long? Doubtful they will make it 4 years with out some major problem.
I, was waiting for Skylake because it finally offered the opportunity for Apple to put a quad core in a 13" (not the retina) something new, beefier, more of a cMBP SE Stretched to a full 13 by 9 maybe thinned a bit to .86 but thick enough for a couple of 3mm fans that flow well and are as quiet as my 2010...never hear the fan....ever... and still have a larger thermal envelop than the 15" rMBP (the 2012 13"cMBP has a larger thermal envelop than the 2015 15" rMBP) by about 11 cu in iirc and the 15" uses a 95Watt TDP while the Skylake 6970 is only a 45 Watt TDP, so there is more than enough thermal envelop in the 13" cMBP for a Skylake quad core.
If you are waiting for Performance, a quad core in a 13" is the only real thing worth waiting for - that could bring a huge speed increase in a 13" form factor, and along with it could be more vram from 1.5GB to 3GB or 4GB and increasing RAM to 32GB making it the fastest they have ~ if they stay away from the retina and go with a High Resolution or some other unknown sharper display that doesn't rob the Performance like the retina does.
The retina from a Performance stand point is a leech. They never offered either 13/15 rMBP (1st year) with a HDD because, even with a SSD it was slower than the cMBP's...with HDD's. I still shake my head at that in disbelief and wonder WTF were they thinking...
The only thing that finally made them just slightly faster (5%-13%) was doubling the vram in the 13 and 15 increasing the CPU speed and faster RAM in the 13. The 15"s have gotten slower benchmarks than the previous model since the peak in 2014 when the 15" 2.8's w/dGPU were faster than the 2015 15" 2.8 w/dGPU and again it was only the doubling the vram to 2GB that made them faster than the 2013 15" rMBP or, the 2012 15" cMBP.
Here's what gets me, most of our use of the retina (and the advancements of the computer year after year) are spent on the seeing of Ads better when you don't want to see any at all, and it is the pervasive use of Ads on every page you visit (and 75% of most pages) are Ads and the 30-40 Ad trackers Sponsors and Ad Placement Controls, and the automatic playing of video Ads as you scroll past the 2-3 video Ads on pages that you went to see some other actual video story on trying to play at the same time, that slows down and freezes up your computer almost every time.
With only 4 threads or 8 threads (dual or quad core) and one pretty much always dedicated to help run the display and 4 GB of RAM being used to help it. A 16Gb RAM Quad core is basically a 3 core with 12GB of RAM with 7 threads. 7 threads that get gobbled up by your browser and your viewing habits (the Tabs and loaded websites you always have open) and the Advertisers ALWAYS demanding more of your system than it was designed for, and that is before you open other Apps or Programs.
Maybe the best way to speed up and future proof a Skylake or any other new system (today) is to add an integrated or Discreet Ad Processing Unit (dAPU) with 2? 4? or 8 GB of its own vRAM....maybe when we hit Tiger Lake and 5 nm chips they will have enough room.