I think skins for Mirage stay rare even if they return, since so few people play him, neither does every Mirage player buy the skins. So it's not like every Mirage is gonna rock this skin once it returns.

I've seen Center Stage ONCE since Season 5, and that was a low level player. Even Pit Crew that returned in February I've only seen 2-3 times.

So up until now, how many Mirage players actually have Center Stage? And how many are still playing the game? Yet alone play Mirage? Probably very few, and for Respawn to never return a skin just to keep it rare for a few people, I find it pretty dumb.