I'm also a BLT member who loves the walk to MK. But, the distance between CBR and SSR and Epcot's "outpost" (which has a huge staging area for plants and such behind it) is actually quite far. The trek from SSR would be through a woodland. I can see how Disney wouldn't want to subject their guests to that.
When they originally were talking about converting part of CBR to DVC, I suggested they should re-route the monorail. Instead of looping through Epcot, it would divert around the outside of Epcot (over parking lots, all easy construction), swing around to the new resort, and then swing back by way of the Boardwalk (along the road right of way), route between the IG and BCV (you'd lose a few trees due to the construction), and then connect to the existing track to go to the passenger unloading area.