The 9.7" has been a success for me. I've owned apple products since 2005, but this was the first iPad I ever bought. I'm having an absolute blast with it!
I think today's news suggests the Pro line isn't doing that well. iPad chose to innovate on the lower cost iPad and drop the price. The iPad Pros (either size) are popular with certain professionals but don't seem to have been bought by a broader audience to replace their older iPads or to replace laptops.
Depending on what happens with the iPad Pro update later this year, I may end up selling both my 2015 Macbook Pro and my iPad Pro and just buying a souped up Retina Macbook
You are completely right about track pad support. It's such a crucial part of a normal computer and the finger just can't compare for a lot of the smaller fiddly tasks.Sales are slumping because a) people don't replace iPads like they do phones; b) software support is still excellent; c) performance on older models is still there; d) despite Apple's (terrible, IMO) marketing campaign, these things won't be a true desktop replacement until they give us some damn trackpad support.
Seriously, if I could use a mouse or a trackpad, I probably would have sold my Macbook Pro a long time ago. No matter how much Jobs/Cook want us to think otherwise, using your finger to choose a cell when using Excel or trying to place a cursor in a pinpoint spot of a Word document is NOT ergonomically optimized. It just isn't. And no, the Pencil isn't a substitute for this sort of thing because I still have to move my arm.
I love my iPad Pro but Tim Cook and Phil Schiller are kidding themselves if they think I can actually do "real" work on it for long periods of time. The fact that it has a processor that's faster than most of the Intel processors and a big gorgeous screen is great, and I truly believe the iPad Pro has all the horsepower required to to big-time work, but they need to do some serious interface work w/iOS in order to make it a workhorse, including but not limited to adding freaking trackpad support.
I would say that the 9.7 inch iPad Pro has been a failure, not as a product (it's a nice upgrade over the Air 2), but it failed to offer sufficient advantages over the Air 2 to justify its cost and I doubt it has sold particularly well as a result.
I suspect this is becasue it was designed to have simply replaced the Air 2, but Apple wanted to raise the price so kept the Air 2 around to give it some cover against criticism and lost sales from raising the price.
It might have worked if the differences between the Pro and Air 2 were a bit more meaningful, but the Apple pencil is a somewhat niche item (although also great!) and the Apple keyboard is no better than many aftermarket solutions compatible with both the Pro and Air 2. Software still runs fine on the Air 2 and I cannot think of anything which really benefits from the Pro's faster processor.
The new iPad (with the A9 processor) is a slight downgrade in terms of thickness and display, which I suspect is to try and avoid this problem when they release the 9.7 Pro refresh next month (hopefully).
By contrast, I think the 12 inch Pro was a success on launch, but has since suffered from inattention (like pretty much every product in Apple's line-up at the moment). With some nurturing I could see it giving Surface Pros and the like some really strong competition. But right now I think Apple might snatch defeat from the jaws of victory unless they get iOS to be as 'Pro' as the hardware.