Grew up with sports cars. Loved bringing the rev's up when downshifting and even did some racing. Having that said, with a high-torque motor and 8-speeds, it would be kinda like driving a semi-truck.
This past weekend I was driving in some hills, and after going up & down and some climbing, the tranny automatically selected the best gear to keep the rev's up for power and didn't upshift. Even when the road leveled out, it still held the present gear for about a minute and then realized the hills were no longer, and then proceeded to go into economy mode and selected the highest gear... Very Impressive!
Also having a shifter would greatly limit the middle space around the center stack and/or tranny hump (one of the advantages of the dial gear selector). Regardless if you chose the middle seat option or the center console option, the functionality and ergonomics, I think, would be greatly impacted in a negative way, but wouldn't surprise me if RAM has it in the 2500 or as a commercial option of some kind.