I'm guessing they made the change from user feedback just like StormTrooper suggested. I don't believe they would have changed it just "because" when the dial has only been around for a few years to begin with.
There's a myriad of reasons why I don't like it but top of mind is because I want to shift my vehicle, not tune it to a different station and I've found it to be un-safe when needing to make quick shifts. My wife has my Durango now and she hates it too. I often watch her pull into her parking space, set the e-brake and try and turn the ignition off while still in drive, something that I had done as well. The dial is just another dial amongst dials and it gets lost. You also have to look at it (or the EVIC) to figure out what's going on, there is no tactile sensation of being in park or drive. Just because it won't turn left or right don't mean chit, you still have to look to see what gear you're in.
For the record, I'm 51 and grew up with real cars that had real shifters. One of the main reasons I bought the Durango is because it still has a push rod v-8, not like all that pansy stuff Ford tries to sell. And yeah, I know the t-shifter really doesn't do anything mechanical, it's the thought of it and the feel. I bought the Durango knowing that we'd switch the dial out because parts were coming.