They need someone to point that out to them? Seriously? Without a roll-down gate to close a park, I can envision the fanboys and/or nutjobs trying to sneak in overnight as well.
Slightly off topic, but in terms of security and people getting in without tickets (as may be more likely without turnstyles), as it currently stands it is actually not that difficult to get around the security checks at Epcot and even get in possibly without a ticket.
I'm sure security is supposed to be watching, but a nylon rope doesn't seem to cut it.