Just my opinion of course, but an XR-style iPad makes sense from everyone’s position. It needs the look of the Pro at 75% of the cost. That would be $600, a much more reasonable asking price for a premium casual internet surfing device. $800 for the Pro is just silly overkill for most everyone until it can actually replace their laptop.
Current iPads may not have outside competition but why spend $800 when your four year old iPad still works fine? Or why buy the $329 model when the screen, arguably the most important component of a tablet, is a downgrade from your four year old iPad’s screen? Cook needs to sell iPads but his two newest entries are at the extreme opposite ends of the price range. Offer something new in the middle as an upsell and I bet it becomes the volume leader like XR is for iPhone.
I'd strongly consider something like that, esp. since I'm coming from an iPad Air 2, as long as they don't significantly reduce the pixel density* (like they did for the XR vs. the Plus and X). The iPad Air 2 was essentially the precursor to the Pro, at their previous iPad price point, but then they upgraded it even more and made the Pro line at a much higher price. Then they dumbed down the non-Pro iPads to hit a lower price point, leaving a gap in the middle.
I'd consider buying a 4 GB iPad over a 3 GB iPad with slower SoC if the price difference was say $150. Also, at this point in 2019, I'm not interested in getting any A10 based iPad. I already have an A10 based iPhone 7 Plus, and I'd want an upgrade in both SoC speed and RAM, esp. for something like the iPad which has a higher resolution screen and more demanding interface features. A11 would be a good choice, but A10X would also suffice. Rough Geekbench scores:
A12X @ 2.5 GHz: 18400
A12 @ 2.5 GHz: 11700
A11 @ 2.4 GHz: 10900
A10X @ 2.4 GHz: 9600
A10 @ 2.3 GHz: 6100
As you can see, there is a huge jump in performance between A10 and A10X or A11. That, along with 4 GB RAM, would ensure the iPad we purchase this year would have longevity.
The only thing I worry about is that the mid-range iPad will start at 64 GB and then jump to 256 GB, without any 128 GB option. As for the iPad Pro, I simply won't buy one at current price points, regardless of what the specs are. Also, it would be annoying to see the 10+" iPads lose free MS Office support.
*Yes I'm aware that the 9.7" iPads have lower pixel density than the iPhone XR, but I use iPads and phones differently.