APC-C is not obsolete, and even if it becomes obsolete, it won't be because everyone is moving to FF.
- An APS-C sensor will always cost a fraction of what a FF sensor costs (read Canons FF whitepaper if you want to know why that is)
Is that important if a aps-c is 1 dollar and a ff is 2 dollars?
- APS-C cameras can be built smaller, lighter and cheaper than their FF counterparts
Not a lot smaller - and not everyone wants miniature featherweight bodies like the NEX5
- Lenses designed for APS-C can be built smaller, lighter and cheaper (especially in the non-tele focal ranges) than their FF counterparts
and be expensive as Canon wont be able support economies of scale
Even disregarding the cost of the sensor, there are enough other reasons why smaller sensor formats make sense. Just think about why mirrorless cameras have become so popular: Mainly because they offer DSLR-like quality in a much smaller form factor. To a lot of people, this is important (probably not to the majority of people on this site, though).
That is why they are moving to larger sensors and aps-c then?
If there's a sensor format that's obsolete, it's APS-H. Born out of technical circumstances, used only by a single manufacturer (Canon) on a single, relatively low volume line of cameras (the 1D series) and never having a wide-angle or even just a standard zoom with crop-factor-adjusted focal lengths for it. I still don't get why people think this is the future, while on the other hand, Canon (and other manufacturers) have built complete lineups of cameras, lenses and accessories for FF and APS-C.
Of course the APS-H cameras themselves were/are brilliant, but they were for people who knew why they needed them.
So you think 1.6 aps-c is obsolete because they are only used by a single manufacturer (Canon).
What on earth is a 'standard' zoom? If you are talking about a 70-200 - then why isn't there an aps-c crop-factor-adjusted lens? If you are talking about the 18-55 then the 24-70 is very very close to 1.3 adjusted
APS-H is a lot cheaper to make than ff too - so does that means they are not obsolete then?