Not on the verge anymore. In the last few years, Mets have outdrawn the Yankees on the radio but that could be because Mets are on an all sports station while Yankees are on an all news station.
Radio coverage is changing next year. NYY moving from WCBS (all-news) to WFAN (all-sports), replacing the Mets on WFAN. (AFAICT, WCBS and WFAN have the same corporate parent).
I don't know where the Mets are going, but haven't taken time to investigate...
See http://www.bloomberg.com/news/2013-09-11/yankees-reach-multiyear-agreement-to-be-broadcast-on-wfan-radio.html