3. As I've said for YEARS: APS-H is dead. Please don't keep resurrecting it. APS-H is now an unnecessary 'half way house' between APS-C and FF. The 6D particularly demonstrates that. Leave it to RIP, please!
- APS-C for budget sensor, on camera flash, 'reach' (ie pixel density for certain applications - eg birding, some sports), and to make use of the wonderful array of EF-S lenses (many of which are L class in terms of image quality.
- FF for more depth of field (DOF) control and per pixel sharpness, lower noise, and possibly in the (near) future, an overall much higher resolution photo - already competing with Medium Format.
Maybe you're right, APS-H is an unnecessary compromise between FF and APS-C.
If you're right, we can consider G15 is an unnecessary compromise between standard point&shoot cameras and EOS M.
And maybe APS-C sensor is an unnecessary compromise between P&Ss and FF.
And maybe P&Ss are unnecessary compromises between smartphones and FF.
Well, I think that a few compromises deserve to survive.
The comparison you're drawing between target marketing and product lines within the DSLR realm and the non-DSLR (let's call them 'P&S') realm is flawed, based on both market dynamics as well as the business / technology spectrum.
Canon produces a whole lot more P&S cameras than DSLR bodies. Many more models, and sell more P&S than DSLRs (though DSLRs have increased as a proportion of P&S in the past 10 years in particular).
There is a lot more market latitude for models like the G15 and even the EOS-M (above the standard small P&S) than for an APS-H between APS-C and FF. Also, if one looks carefully at DSLR lenses, most are best suited to either an APS-C (EF-S) OR FF (EF). EF lenses on APS-H can of course 'work' - but often they are better on either a FF or APS-C depending on the required application.
Similarly, a comparison of P&S between smart phone and DSLR isn't quite justified... though certainly the market will segment with an increasing number of smart phone cameras, as some of them have decent cameras included in recent times.
I do appreciate that there are some compromises between A and Z which do deserve to survive. That's where I see APS-C sitting (though even that I concede in the future may disappear... not in the near future, but possibly who knows what will happen in 20 years?!) 20 years ago the thought of a (FF) digital DSLR was a very 'futuristic' idea, let alone one with Live-View that could record movies.