In the even that both tunnels had to go OOS, what would they do?Drop back 10 yards and punt. It would be total gridlock on the roads. NJT could operate as far as Newark. Secaucus has no place to turn/store trains so I don't see them going there. Maybe one or two trains an hour but that's it.
PATH would be overloaded but the only option. DL&W/Erie lines all would operate to Hobo. Lots and lots of telecommuting for those lucky enough to do that. Otherwise lots of job loss and business failures but hey, the billionaires need tax breaks a lot more than us slobs needing a job so let's cut funding for the gateway tunnel.