The rumor posts and discussion forums here are starting to remind me of Blackberry/Crackberry forums around 2012. Canon is clearly not innovating fast enough relative to competitors, but it's still making plenty of money and has significant market share. Reusing the 5DIV and 6DII sensors makes perfect economic sense, but these are 2-3 year old sensors already. Maybe these are stopgap products, but maybe not. Remember, Canon has a 4 year product cycle, if not longer, and as we've seen with the 5D series, 7D, 6D, 80D, etc., it will defend that product cycle at all costs. That means the bodies it's putting out now will be sold for 3-4 more years, at which point their sensors will be nearing 8 years old, in some cases. These sensors are already outclassed by competitors at launch. 3 years from now, Canon will still be selling the RP, with 4k30fps, with who knows what other handicaps. That's pretty crazy. Who is willing to bet against Sony, Fuji, Panasonic, etc. getting to 4k120 next year?
Nothing to do, of course, for those invested in Canon glass. And no need to panic. The pros will get their work done with the bodies they have, and the rest of us are just messing around.