Right now I can get the EOS R for 2149, which includes a free adapter. Do you think it will get any cheaper than that as it gets closer to Black Friday?
I can only speculate, but I think you put things on sale to give sales a boost, and with the EOS R being so new, I bet they are selling as many as they can make. So no point in discounting it so soon after introduction. (B&H has a nice sale on the 5D MK 4 and 6D Mk 2 however)