Gonna add to this bit and note that if Warner Bros. gets the Bond distribution rights and then EON Productions themselves, that would give them carte blanche to acquire MGM.
MGM (through United Artists) co-owns the the copyrights/trademarks of Bond as well as the video distribution rights to the films, which is undeniably MGM's most valuable asset. Warner Bros. also holds the rights MGM's pre-1986 film library and has been co-producing and distributing a hefty amount of MGM's recent films (such as The Hobbit trilogy, Creed, and the upcoming Tomb Raider film).
Getting MGM also allows Warner Bros. access to the film/television library of other studios MGM's acquired over the years, such as the aforementioned United Artists, Orion Pictures, Polygram, and the pre-1994 Castle Rock Entertainment library (that studio of which has been a longtime Warner Bros. subsidiary).