Actually, I think it would be possible to split the difference and build an intersection, though it would be a rather ambitious undertaking. From the topographical layer on iMaps, Western lies at approximately 278 feet above sea level when it crosses Saunders. From there, it rises slightly to around 284 feet at the McDowell/Dawson interchange, and subsequently drops down to 264 feet at the intersection with Fayetteville St. (the disconnected portion, just west of the railroad bridge)
McDowell/Dawson sit at about 260 feet as they go under the interchange. That’s a ~25 foot difference between the bridge and the road beneath, but MLK is at nearly the same elevation just down the street.
To me, it seems feasible to rebuild Western/MLK to a lower elevation where they cross McDowell/Dawson, and to simultaneously raise McDowell/Dawson to connect with a surface level intersection.
Now, this would be a lot of work for arguably little benefit, so unless a few of the surrounding properties (Heritage Park?) and the space freed up by removing the interchange were leveraged to promote new development, it’s a rather unlikely undertaking.