In my limited experience, and from talking to superintendents, paspalum does not quite live up to the promise of its press releases. [In fact, many discussions on this web site about turf grass are full of press-release claims that haven't stood up in the field.] For one thing, not even paspalum can take high salt levels on a full-time basis; you still need a lot of fresh water reserve for it. And, as Anthony alluded, it's an expensive grass to maintain in fine condition ... that's why the turf grass powers that be have endorsed it.
I am sure that in the right hands, paspalum can work wonders. So can bermuda, zoysia, and other options. It's not a miracle cure for golf, but it will likely continue to play a bigger role going forward.