We must remove our "retrobike" glasses here and be aware that the reason there is still 7 speed, 8 speed or 9 speed stuff (or even 6 speed) is an economic term called Market Segmentation. Basically, I want to sell stuff to the people willing to pay 10k for a bike, but also to those that only can/want to spend 500, so I have to show them there is a difference if you pay more. It is the same reason you can pay 15$ to be the first to watch a film in the cinema, or wait 5 years and watch it for free in your TV.
If they make a group for 9/10/11 speed where the only change is how many "clicks" your shifter does, I just don't see how the bike manufacturers will be able to sell you a bike for 2000$ when you can just get the 800 version, change cassette and shifter, and voilá, your 9 speed is now an 11! And they will still have to make 7 and 8 speed groupsets or Sunrace/microshift will dominate the entry market. The current success of Shimano and why I think SRAM will never overtake them is that your first bike usually comes with Shimano, and many follow them in their next better bike.
What I hate the most is this "it's 2015 and 27.5" wheels are coming" feeling where a lot of previous stuff will be made obsolete for just marginal gains. Is Shimano really looking to make life easier for bike manufacturers and workshops? reduce number of replacement parts?
Why not then leave everything as it is, and in future models of your stuff:
-keep BCD on your chainrings defined and fixed, and all your chainrings compatible, so we don't have headaches looking for a matching spare
-design all new cranks with one (1) axle lenght, so you only need to think if your BB is 68mm or 73mm.
-same with only one (1) chainline for all front mtb derailleurs (50mm) and maybe one for road derailleurs. That's it
-all disk brake models should take a single design replacement pad. You can pick organic or metal, but all will fit your brakes
-brake levers and shifters should attach separately to the handlebar. I don't want I-Spec, I-Spec II, I-Spec B and whatever
-keep hyperglide as freehub standard also for 12 speed or higher. Sunrace has proven it is possible.
-keep one single standard for removing center-lock disk brakes or Hollowtech II BBs
-stop changing the standard for attaching disk brakes to the frame
Only with those measures, most introduced by Shimano themselves with zero to negligible improvement in performance or durability, we would greatly help users, shops and manufactures to make their lives easier.