If both partners are NOT willing to work at it, then I think these concepts will help one become a better, more confident, and less enmeshed person, but I don't think it will save your marriage, nor will it improve your sex life.
The sex won't be better, but you'll become better able to DEAL with it.
That is about the same as my opinion.
One/two years ago, a poster on another group here asked about the same thing. The vote was the DB site was well worth trying, helped the individual poster grow/learn a few things not to do/learned a few things to do better, and in general thought the site did worlds of good not to change partners only to have the same issues in the next R.
Something like my thoughts, If the current R has problems, learn as much about making the current R better, you paid for it, worked for it, so why not use it as a test bed for the future better you. Who knows, your next partner might be the one you live with now.
The main thought was you are part of the R problem, even if you do too much for your SO, so change your habits now, fix you and maybe some good will come your way.
