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The Dell creative push has already begun to encompass me - a long time buyer of Apple (just how long I'll hint at in a moment) - when I recently bought a Dell UP2715K 27-inch "retina" display for my Mac Pro:
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and let the higher-end creative market languish with the positively ancient "sandpaper to my eyes" Thunderbolt Display. ...
This isn't a new trend. Apple has been out of the display business since 2010. It is similar to how they eventually got out of printers. What they have what has been called a "Display" over the last 5 years but it is really a Display Docking station. There is a cable+plug to power your Macbook something right on the "Display".
You can go back and look in the archives of this forum, but even before 2009 there is a fairly high mention/use/recommendation of several high quality 3rd party monitors. NEC, Ezio , high upper subset of HP and Dell. There are lots of viable options of a larger group's upper end offerings ( ASUS , LG , Samsung, etc. ). It isn't like Apple has to be present for there to be a viable market to upper end displays.
Apple introduced a Sharp 4K display right alongside the Mac Pro ( after leaking a bit a couple weeks early
https://www.macrumors.com/2013/12/0...arp-displays-in-european-online-apple-stores/ )
The dedicated display business? Apple got out about half a decade ago. It is highly unlikely they are coming back.
Now, Apple may redeem themselves later this year or early next with an Apple Retina 5K Display but for a company that once prided itself on innovations like these -
Apple might introduce a new display docking station. If the 21.5" iMac goes Retina (4K) that is probably a more likely candidate for a new display docking station than 5K.
Technically some of new Gen 6 (Skylake CPU) iGPUs can output 2 DisplayPort v1.2 streams that Thunderbolt 3 could provision via MST to a 5K display. The overall Gen 9 graphics can
http://arstechnica.com/gadgets/2015...re-intel-is-still-gunning-for-dedicated-gpus/
If you just skip that HDMI 2 converter and couple both DP v1.2 outputs to the TB v3 controller inputs, it is doable. However, I'm not sure that is going to go all the way down in the Core M (Macbook) and Core i7 U ( Macbook Air ) zone with their implementations of Gen 9 GPU. Historically, Intel has trimmed off some of the display output range as move down to the lowest power implementations. Unless they can cover the MBA's for docking station usage, a 5K docking station product probably doesn't have a large enough market to be viable. Any Mac Pro couplings would be just "gravy on top" sales. The Mac Pro isn't the primary target of these docking stations. Hasn't been for a very long time.
I think the docking stations would do better if more affordable and a "Retina" 4K would be. This $999 price point isn't particularly viable when there are $600 5K displays out there.
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&cs=04&l=en&sku=210-ADOF
Pretty soon there will be $500 ones and and even more affordable 4K ones at smaller sizes. The docking station is "nice" but if folks just want a Retina display for their laptop and they have two TB ports there are other ways to do it. If Apple can only manage to do just one display docking station then Retina 4K is better than 5K.
There are plenty of very good 5K displays to buy. There will be even more of them by Jan-May 2016 when the 2nd generation implementations will be in full launch mode.