History usually repeats itself and that's what Americans prefer. Both Canon and Nikon sell feeder products as APS-C in the attempting to get you to eventually upgrade to a full frame. At least Sony is getting the right idea with the A7. Americans usually equate bigger as better. Just look at the US military and the attitude of Americans overseas and you know what their culture traits are. Unless Americans make a drastic culture change which I think is hardly the case. We've been through this kind of thing in the early 80s with film and, guess what people said then? Blah blah Nikon, Canon and 35mm will be taken over by 110. That time, it was called the Pentax System 10 which uses the 110 film format. The camera was known as the Pentax Auto 110. It was small, the same size as the E-PL1 or maybe E-PL5 and the hope was, people will prefer the smaller format. It was sold until 1985 and then gone! As we know now, 35mm film DSLR kept going along despite the fact that there were other competing formats.Nikon and Canon are still doing extremely well with DSLRs, and mirrorless sales in the US are not all that strong, true, but to say "always will be" just doesn't work. Every camera manufacturer that has said "is and always will be" has gotten very sharp corrections from the photographic marketplace.
Today, m43, E-mount, A-mount, APS-C blah blah are just a repeat of history in the early 80s. And what happened to Pentax now? Relegated to the small division of Ricoh. No one had seen this coming -- no one because most of them like most of you now are blinded by the truth!