Technically the plea would have called for Carneglia and Genie to admit the existence of the family. But at that point John was so batshit anti-government that he probably would have vetoed a deal that didn't even include an allocution.

For all of the criticism JG got for being too flashy, his biggest mistake as a boss was his failure to see that plea bargains were the future of the mob. The Genovese and Lucchese families were way out in front in that respect. Under their collective leadership, guys like Barney and Stevie have taken the plea bargain and made it an art form. It's one of the things allowing them to hang on.

Short version: It ain't 1950 anymore .