TRENTON, Sept. 6 — The proposal to build a $355 million sports arena in Newark and redevelop the Meadowlands fell apart today when a key Assembly committee canceled a hearing on the issue, effectively derailing the legislation. The plan would have provided a new home for the New Jersey Nets and New Jersey Devils, and was seen as vital to helping further the renaissance of downtown Newark. But in recent weeks the plan had come under increasing scrutiny, with the Republican candidate for governor, Bret D. Schundler, warning that taxpayers might end up footing some of the bill and calling ...