I still think that over an 82 game season, it'll take a long term injury to Lopez or Young to result in the kind of utter futility you're talking about.
That said, the Nets team that won 12 games back in 2010 had Brook Lopez putting up 18 and 8 for 82 games, in addition to Devin Harris putting up 17 and 6 for over 60 games, and Courtney Lee playing at his usual OK level for 70+ games.
The only person on that team who shot over 50% from the field was Josh Boone.
If the Nets continue to get nothing from their supporting cast and Jack and Joe continue to play like they're almost totally washed up, then a bottom 5 record is absolutely in play.
