Blog Post
As most people below have already stated, the end reward is not worth the effort for most players.
May I suggest something similar, but with a greater draw for players.
In Everquest II, the player base all came together to build a large tower in one of the community zones to ascend to a brand new zone in the sky. Each server's player base worked really hard to unlock this new content.
Similarly, swgoh could introduce a new "Event" of dark Troopers, death Troopers, etc. that spawn as players make their way down a long hallway that leads to the bridge of the new Imperial Remnants Capital ship (Moff Gideon's Light Cruiser from the Mando series)
When enough Troopers are cleared out, the ship will be unlocked for the players who participated.
Lauched via a shuttle, land in the hangar, just like the mando series, and fight your way to the bridge to take control of the ship.