The 1Ds range was the curiosity. No one wanted to pay for a 1D series landscape high mp camera. There are more 5D series cameras in the hands of working professional photographers than any 1D series. Very few pro's actually bought the 1D series. Most pros need a pair of identical bodies. The size, weight and cost of a pair of 1Ds cameras is prohibitive. Canon has made more profit from the 5D series than any other camera range. Which, I belive is why the R5 and R6 are the central backbone to the Canon mirrorless system. The R5 is the most versatile camera ever made, in my opinion with the R6 followed very closely behind. If Canon decided to make a pair of pro cameras, the R1 and R3, I'm not sure there is much of a market for both of them. However as halo items...that's a different story.