The basic idea behind Jerome was not to make him the Joker, but to inspire the next insane Crown Prince of Crime to come to life, as it were.  Yes they could have done a lot more with him, but for the time Jerome was around, he was damn awesome.  ;D  But I kinda like where you're going with this idea Silk.  We could use a much younger, but no less dangerous Joker running around.  Insanity tends to be contagious lol.