You are probably right. Was going to write "would be interesting how many people would pay 100-200 $ more to get a second cable, second DP chip and GPU scaling instead of hardware scaling - with much better scalability and many interesting options - like e.g. gradually more/less GPU-intensive 110/140/170/200° high ppd modes etc, so you can chose between high ppd or high fov nowadays and get both in the future".
Even with the disadvantages of the current generation (80 Hz, no DSC, two cables) it would imho be the more interesting device.
But then: People had this option at the Kickstarter campaign and deliberately chose the 8k. So it is presumably the thing most prefer.
And yes - a 2019 8k X with still two cables but 90+ Hz, optionally one cable via DSC, eye tracking already included/available, possibly further refined lenses and perhaps even a better display would indeed be a (potentially huge) step up to what would be possible here and now - with better GPUs available to drive it.
As long as the multi billion dollar companies still wait with similar offerings... (they might withhold in 2019, but as soon as GPUs able to drive such hardware in native (+ appropriate supersampling) resolution becomes mainstream they will most likely jump on the train).