Legacy for all suvivors
I want to be clear on one point, the legacy of the 4 original characters will remain exclusive, as a matter of respect for the players who supported the game from the beginning. But why not create legacy for all unlockable survivors after reaching a certain goal with them? for example, adding more prestige and if you complete all of them you will unlock the legacy on that particular character, or maybe give goals that have something to do with the lore of the character, for example you could create a series of goals that recalls the character's story highlighting maybe his habits and forcing the player to play the original perks of the character in question. For example, if you want Ash Williams' Legacy, you have to play "bravely" by taking a certain amount of protection hits, saving the other survivors, etc., etc. Their goals will be like a path, similar to the rift route to get amulets.
Comments
The point was to reward all the original players who stuck through the myriad of issues this relatively unknown game had. They grinded out the Prestige levels on significantly more expensive Bloodwebs, and under a strict time limit as well.
Introducing it for the new characters wouldn't make sense. The Prestige Bloody Clothing is already a reward for sticking with a certain character for a while.
If you have a method of obtaining Legacy now, that removes the value of the skin. Regardless of if the method is challenging, you'll have an indefinite amount of time to do so.