Players Association executive director Billy Hunter warned NBA players on Wednesday that the league’s proposal of a “hard-flex” salary cap would have grave consequences for the future earnings and security of rank-and-file union members.

The owners’ plan “would decimate the middle class, with teams using the bulk of their hard cap room on star players,” Hunter wrote to players in an email obtained by Yahoo! Sports.

Hunter stayed on his theme of disparaging the league’s offer of a flex cap, promising doomsday scenarios over the course of the 10-year deal the NBA has proposed to players.

The letter was sent to the players as a prelude to Thursday’s bargaining session in New York that could be the final one before the league possibly imposes a lockout at 12:01 a.m. ET Friday.