I think it was fairly obvious that he meant "the only one left at Southfork," (of the original family.)
Jock, Miss Ellie, and J.R. are dead. Clayton is dead. (And as cardinal biggles asked me earlier, where exactly is he buried? He sold the Southern Cross, so its unlikely he'd be there. Maybe he was cremated?) Pam is dead. April is dead. (And in the case of the latter, she's not been mentioned a single time since the revival began.)
We even see Aaron Southworth, Miss Ellie's father's grave. We can assume his son (Miss Ellie's brother) Garrison is dead by now, as would be Jason Ewing and as we know from the old show, his daughter Jamie is as well.
Everyone else who would be eligible or possibly eligible to be buried on Southfork is still alive. Ray, Gary, Jenna, Charlie, Lucas, Donna, Margaret, Lucy, James, Valene, Mitch, Michelle, Cally, her unnamed son by J.R., Debra-Lynn, her son with James, and Jack are all, presumeably, still "out there" in the Dallas universe.
The point is that of the (blood) members of the family from the original show, Bobby is the last one alive and living at Southfork. That's why the plotline/jokes with John Ross about "remodeling" carried some extra weight. Bobby is representing the middleground between the original show and the new. John Ross is baptized in this episode, given his father's belt buckle and watch, and is already wheeling and dealing to make trouble.
This coincided, beautifully, I thought, with Elena's first steps toward becoming the Ewings' new antagonist (if not outright enemy and villain of the show). Hers is a storyline I'm quite interested in watching unfold.
