Going with the 'dividend achievers' brand probably draws the unclemicks of the world who have been longtime admirers of the strategy and plausibly buyers of the book and other tools and services. Good for vanguard to get instant brand appeal with a segment that probably isnt a big buyer of mutual funds. Not so good for mergent who sees brand expansion but may lose revenues. Go without the brand and its just another high dividend value fund and vanguard already has a boatful of those.
Unfortunately for us, we'll end up paying whatever vanguard gives up at the negotiating table to suit mergent as a higher ER.