I am planning on a 1dx III upgrade, but I think I will probably complement with an R II or high MP if they deliver a 5dV equivalent camera like they did with the 90d / m6 II. I will probably hold off on RF lenses and adapt my EF lenses until the point I move away from wildlife. I am 67 and that 36lbs of camera gear + tripod gets heavier every trip. I figure when I hit 70 it will be time to give up the 1dx III. I would probably pass on the 1dx III if it wasn't for 2 more trips to Africa, 1 trip to Antarctica, 4 trips to the National Parks, etc, etc by the end of 2022.