So, if the 6D moves upwards in specs and price, it is going to be positioned approximately where the 5D3 is now. Since the 7D2 will surely eat part of the current 5D3 market, and if the future 5D4 possibly goes Hi-MP, then there will be room for a new entry level FF... I mean, something equivalent to the Rebel line, but FF. What do you guys think, is it realistic a possible lineup with 4 FF and 4 APS-C dSLRs for all demands and all wallets?
edit: actually, there are 5 APS-C dSLRs currently available, I forgot the 100D.
I think that there is space for two more FF models below 6D or its successor. One would be simple FF - equivalent to 700D and the other would be small and simple FF - equivalent to 100D. Please note that previously the price and size of FF models was gated by the price of the sensor and the bulk of the electronics. With the cheap FF sensors and densely integrated electronics, we can have small DSLR cameras, but with FF sensor. It is only a matter of time before FF DSLRs bodies will be sold at $500 street price. Note that Canon would need to develop cheap kit zoom - 28-55 and cheap tele zoom 55-300 for these cameras.
Well, if we consider the near future and IF the rumor of the 6D2 moving upwards in specs is true, then one more... maybe, but hardly two, even in the long term. At this point, a FF mirrorless is more likely to happen than a cheap pentamirror FF. As you said, a cheap <1k$ FF would make sense along with cheap kit lenses, so why Canon shoud invest there when they know there's demand for a FF mirrorless? Just my thought, though.