I'm still foolishly hoping that Samsung one day will swoop in with a Galaxy Note Tab 8 - 8" with a S Pen - and destroy the iPad Mini while waking people up to the fact that this size category actually is pretty wonderful.
Of course larger tablets are better for many things. But the 8" size is so light and pocketable. I absolutely prefer it for reading, gaming, note taking...just about everything. When I did have an iPad Air, I'd anyway always end up using my 15" MBP instead of it.
While commuting the bigger iPads feel too cumbersome and weird to pull up when squeezed in between other people. For extended gaming or reading they're just too heavy, and touch screen gaming doesn't get better over 8" IMO unless playing a board game or something with several players. For watching movies while traveling, 8" is enough most of the time at least for me.
Add do that the superb note taking functions of the Note + S Pen - without having to buy an $99 accessory - and a Note 8" would be the perfect digital Moleskine/gaming device/e-reader/web browser/entertainment pad.
Another key element of course being the OLED screen, which Apple doesn't seem interested in bringing to the iPad series. Maybe fortunately so as I probably wouldn't want to know how much they'd charge for that... OLED continues to just smash any IPS displays I've ever seen for basically all uses, and that includes the fancy pants iPad Pro displays.
Lastly a 8" tablet would allow me to go back to using a smaller smartphone instead of the current 'phablet' (remember that word??) category which has become the gold standard. The tablet would still be small enough to pocket/whip up out of the bag quickly, and the smartphone would be one handed usable again. Add a good smart watch and I'm golden. Honestly this combo would make me not need any of these coming foldable devices either (until they start getting really good, and more affordable).
TL;DR - the 8" tablet category is being largely ignored, while being the functionally best size category for many if not most tablet uses. Probably this is intentionally so, since manufacturers would rather sell us their expensive phablets + large tablets that we currently think are the best possible options. I'm sure that if Apple, Samsung et al would prefer that we preferred the 8" tablet category, then they could easily make us.
All IMO of course
And sorry for what is maybe considered a derail...but somewhere in all this I guess I'm trying to say that the tablet device as such being just a tad smaller than the current standard would also improve its functionality and solve some of its problems.