Things in perspective...If Canon takes a hole year (one more....) to send to he market a great mirrorless camera it will loose a LOT of costumers. Why? Well...it´s very predictable that Sony can send new cameras this year....There has been some talks about the new A7SIII and about the new A7r4 (I believe it´s a bit early, but Sony doesn´t have the same behaviour of Canon in releasing new cameras.) People that bought this cameras 2 years ago may have the need (or the desire) of a new camera after 2 years. In parallel, people that bought the EOS 5D S (and R) will also start thinking in a upgrade. If Sony delivers a new line of cameras before Canon and if they really respond to the "demands" of the market, or show great specs in evolution terms, well....then people wil not wait any longer for a response by Canon. And if someone buy´s a 3500$ body will not buy another one 6 months later....
For my professional needs, I do have some huge works both in stills and video coming up in middle 2019 and beginning of 2020. I can wait for Canon a little bit longer until the last quarter of the year (but not the announcement date....the release date!!!!) But i do want a LOT to exchange my Sony A7r3 for a Canon to payr with my 1dx mkII. But if Sony releases a killer machine in middle of the year....I may start thinking in a good bye Canon...But don´t want so please Canon give us some good cameras!!
Regarding the roadmap, it makes sense that the next camera to be a high resolution one in the R sistem, I do believe it will be a replacement for the 5Ds series and will be the end of the series in DSLR world. I think Canon will progressively adopt R sistem has the primarily one...I don´t see Canon releasing a new 1dxMKIII soon, although for a long time, the professional line of Canon always was the 1D series and the prosumer cameras the 5D series....So if Canon mentions a professional new camera it should be a 1D series camera....
It is my believe that canon could win a lot by reducing the different lines of cameras, they are way too much cameras....And start compacting things in less cameras!! The market has changed! Sony compacts features and they are having great results in that!
I mentioned this in previous posts in other topics, Canon new R sistem is promising, the EOS R is a great camera for a start, the EOS RP is a great "entry level" camera....but we need the sharks Canon! Especially us, that we do make a living with cameras...we can´t stay behind competition!! 2 years earlier if we wanted a Camera that makes 10 bit 4:2:2 we can only get that on specialized cinema cameras....nowadays you get that on a panasonic gh5, on a Sony A7SII, and if you don´t need that, you can get an ATOMOS and record with HDMI output. Canon doesn´t give you any of this!! Not even the 1dx mkII!
So don´t fool around, don´t splash specs in 4 or 5 different cameras, make 2 great cameras and you´ll have my money! Don´t make it, and Sony will have my money! This is only me talking, but I am one in a LOT on users in the market that think like this! After more that 2 years waiting for Canon response, it more than time!! And I don´t care if its mirrorless or DSLR, just send some god damn great cameras to the market!!!!!