Isn't kinda fishy that universal brought out the old ecto for mass public viewing. Its almost like rekindeling the passion in the population. They had to of spent a large sum of money for it and they dont do these kind of things for no reason.
I also wanna say that anyone who says that the originals actors are to old to make number 3 has to rethink their whole opinion. Ghostbusters never required any specific body type. Bill, Dan, or Harold were never like Arnold or Stalone so why are they throwing this excuse in our faces. Besides you don't really have to be that athletic to be a ghostbuster.