If it's limited, let it be limited and a test grounds. Or would you rather a Eureka situation where who knows how much money and resources went into something the player base world wide vehemently spat at. If a mass of people hated BLU and didn't do masked carnival at all, then that's just 1 element of the game they know to not touch on or learn to improve. If it was a limited job, I'd welcome it to see how it feels. Heck, they could do it with BLU.
You say it's not the game for it, but it was added in PVP. Meaning there was an attempt, there is feedback. It's not impossible.