Suggestion 1: Copy WestWorld.
The Westworld Tablet is a tri-fold design that is opened to display the amount of screen you need. If its a phone call then you just need one panel. If youre showing a small amount of info then you use two panels. And if you need a full tablet then you unfold it completely.
Obviously this is "Sci-Fi Special Effects" but the concept still holds true. Tablets need more versatility in increasing and decreasing surface area. So, while we wouldn't have a paper thin accordion tablet just yet. The iPad is thin enough that carrying a small brick might be an ideal choice for some users.
Suggestion 2:
Improve Siri.
If youre just going to stick with stale old slab designs then at least fix Siri. Apple completely squandered their lead in this technology and their lack of development has made people think "Amazon is great at Voice stuff!". But that isnt true and I really think that Apple could have revolutionized user interfaces if they actually put effort into improving what they started.