considering how hard it is to save up 20k for the average person to actually buy a spawner, getting to change it to something other than pigs ISN'T hard.
You guys can just sink the idea that a mbox changer will ruin the economy,, here is my flawless logic: once 1.9 comes out people will be breeding sheep left and right, wool will be everywhere, same deal, get over it, if monster spawner modifier is implemented, the WHITE wool price will drop currently, but it WILL HAPPEN ANYWAYS when 1.9 is officially released. Dye prices will remain the same as before because nobody wants JUST white wool. EDIT (they like color variants to go with it usually, some cases call for only white wool like certain designs)
Stop this crap about it ruining the economy, because it won't change anything other than the Wool supply atm, which will be flooded soon anyways. I personally want to see an arena where people fight a herd of various monsters for a prize. I also want it so if I have a dungeon spawner that I wanted to keep intact and some noob goes through and breaks it, I can get it replaced by a mod or admin.
Now try to ignore that argument like you did about my obvious statement about how dye prices will still remain the same.