Wither Storm Mode

Ok, so Mojang. I have an idea. People for YEARS and YEARS have begged for a minecraft story mode-esque entity in the vanilla game. I (along with the brilliant community) completley udnerstand that the wither storm may not ever be implemented. So, how about you make it a gamemode? Such as a world type, in which:

-Your locked in survival,

-To beat the game, you must defeat the wither storm,

-More blocks,

-More structures,

-ETC+.

I want to thank you for your time and reading this and I (along with every minecraft player) would LOVE to see the wither-storm in the main-game. 

PS If this gets added i would love a cape!