Deal Complete, NBC Is Planning To Cross-Market
NBC formally announces completion of its acquisition of Vivendi Universal's entertainment operations, promising new entity that will aggressively cross-market its television, movie and theme park properties to drive profits while avoiding pitfalls of previous media mergers; NBC chief Bob Wright will be chairman of new NBC Universal; some industry executives say NBC's history in network television business, with its short-term thinking, might hamper NBC Universal's ambitions; pledge to step up NBC's already intensive cross-marketing immediately draws criticism from consumer groups that have challenged growth of big media companies; Center for Digital Democracy's executive director Jeff Chester says Universal was last real independent outlet for writers; adds writers will work for NBC and will have to do what network tells them to do; Wright also announces NBC has signed long-term deals with anchor Tom Brokaw and Dick Wolf, producer behind successful Law & Order series; Brokaw will continue to produce and be anchor of documentaries for various NBC channels for 10 more years after his retirement from NBC's Nightly News on Dec 1; Wolf agrees to remain housed with NBC Universal at least until 2008; photo (M)