I suspect most people did compare it to the 5D4 and see the R as a bargain. Despite all the talk on these forums, relatively few people actually switch brands. Investment in a system, familiarity and inertia keep most people in-brand. As I previously stated, the majority of ILC users already shoot Canon, so logically Canon should be aiming their products at Canon users for more than one reason. It's Sony and Nikon that need to be more concerned about inducing customers to switch.
Canon has dominated the market for nearly two decades, sells more ILCs than Sony and Nikon combined, and last year gained more market share than Sony. It's painfully obvious that they know more about the ILC market than you or anyone else on this forum.
A lot of the switchers on this forum switched from not actually owning Canon, to not actually owning S*ny.