Replacing all of the Space Camp infrastructure is prohibitively expensive. Besides what would they replace the Shuttle with? The Constellation program was cancelled and there is always the chance that the next U.S. President will just cancel the current President's vision for a manned space program. You could replace all the Space Shuttle stuff with a simulation of the ISS but you'd probably hit the ISS's end of life (2020) before you could get all the Shuttle stuff replaced at Space Camp.
Remember; the shuttles have only been retired now for a little over two years. You can't expect NASA on it's shoestring budget to completely renovate a non-mission critical facility like Space Camp to reflect the reality that the USA's manned space program has an uncertain future in that short a period of time. All Space Camp can do right now is look to the past because whatever future there may be to look forward to is amorphous right now.