I agree but would add that a single tool will destroy the yp revenue stream:
* One: yp-y is hidden - no easy obvious link from yahoo main or my-yahoo (w/o mod).
* Two: yp-y is poorly presented - actual location selection is an "after" choice. Multiple "do this", "click this" loses visitors at each step.
* Three: The actual "use" of yp listings by Yahoo is already, for many/most users, only delivered through local search which is a not very prominent subset of search.
To date, my opinion is that yp-y is an afterthought revenue stream only and I advise my clients not to pay for the privelege of being neglected.
If the entire yellow page format is folded into search it simply becomes over paid inclusion with no control of ratings that could very well be gamed and is then no longer a yellowpages/business directory service.