Exactly. If the Mac Mini had at least the *option* for an external GPU to run decent games, there's a good chance I wouldn't have gone for the PC.
Surely gamers would require updates to closely coincide with the latest and greatest Intel and AMD/NVIDIA releases.
Apple wouldn't want to get into a GPU holy war so they don't bother. The corollary is that they aren't going to get involved in VR either with their current product line-up
And the current iMac couldn't cool sufficiently for anyone wanting a powerful GPU of any variety anyway because it would kill the machines.
So off we go into a world where the iMacs and Minis get a lip-service update in February or March with USB-C ports (cue party poppers from Mac crowd

) but the current Mac Pro limps on until October this year (round about when Intel declare that the CPU it's based on is EOL) and is replaced by an
iMac Pro...
This iMac Pro would use a variant of the Mac Pro cylinder as a weighty base for a 24" 4k DCI-P3
Apple branded screen - big enough and hi-res enough for many users - on a reticulating arm not unlike the one that came with the much remembered G4 Sunflower so users can adjust height and direction to suit. The 24" panel would mean more real estate and not be so big that it would topple. And it would be razor thin and light etc because all the parts that need cooling, along with the ports, would be back in the base unit.
Released from heat constraints of the classic iMacs it would come with multicore Skylake E5 V5 Xeon options (or Intel Skylake-X HEDT CPUs for 6 or more CPU cores) and be crucially reconfigured to include just 1 GPU all the way up to AMD Vega class. It would also have room for 1 or 2 NVMe SSDs only - no HD unless they allow a 2.5" variant only.
Obviously it would be priced to start above the 27" iMac, which might lose a top end SKU, but could start cheaper than the Mac Pro. And crucially the second half of this year sees the release of all-new platforms for this kit rather than going with a dead end current platform and Xeon E5v4 Broadwell CPUs.
Can you imagine Phil Schiller talking about taking the best that the Mac Pro offered and putting it into practice with a next generation product? That gets him out of the 10 year innovating ass remarks from ancient history...
And we also get a pre-recorded Sir Ive video about how they got a light 24" panel that won't topple into a beautiful product...
The 21.5" and 27" iMac series would remain, with the 21.5" either going completely retina by October or having just 1 non-retina base model hang around along with a Retina model for the cheap education market.