In the last 5 years, Sony exploded into the camera world. Just think where we would be without Sony pushing the butts of Canon and Nikon.
We would be more or less where we are today. I think "exploded" is very much exaggerated. I hardly see anybody using Sony A7 cameras when I go to London, Paris, Abu Dhabi, Dubai, Lisbon (where I live), or Muscat. What I see is still the prevalence of people/tourists using entry level DSLR (consumer level) and the prevalence of pros using DSLRs.
I don't think that Canon or Nikon have felt the pressure (yet?), especially Canon have been showing their muscle in the last couple of years, releasing top quality lens after top quality lens, completing revamping their f2.8 pro zoom lenses, their TS lenses, some f1.4 primes, new top quality 16-35 f4 and 24-70 f4 zooms, 11-24 f 4 zoom, their 400, 500, and 600 mm lenses, etc. This is just lenses.
As for their DSLRs, they lagged behind in resolution for a while, but are now the top ones again. I know all about the DR, so no need to mention:) I could mention the Sony compressed raw thing:)
Sony all but have abandoned their NEX APSC line, never made it into a system... no new cameras, no new lenses (even Zeiss and Sigma seem to have forgotten that they exist). The FF A7 seems is gaining momentum, but really, sometimes it seems that only serious hobbyists and some fine art pros are using it. But I am all for it, after all, I am using it and have committed to it. Hope it does not go the way of the dodo, as with other Sony "experiences"...