Holy crud. This may not happen, and if it does, it will sink entire cities crash so many servers because of the brick explosion lag and the troll abuse that it wont even last a day without even being failbinned. And if you want it to be as big as that building by DEFAULT, then my point is even more reinforced. it would take ages to model and animate that thing in blender, and even more to make the script to detect the foot stepping and the glowing on the back, which would also take even more in blender.
It may happen, but the possibilities are really small, and probably will be in a player-sized scale.