According to this article in the OC Register Disney will be starting construction on the removal of the short-term parking lot, and replacing it with a loading/unloading zone. After completion you will no longer be able to lark there for any length of time.
Disneyland converts short-term parking lot | parking, lot, disney - Entertainment - The Orange County Register
So what do you all think of this? For me it was nice to have that parking to do a quick transaction at the ticket booth. It's not the end of the world but it was nice having this convenience.