Well, we both know the people you're talking about aren't interested in fair competition for sleeper resources. What turns them on is pulling the rug out from under a group that is in the middle of a battle with the sleepers.
And since the nature of the wormholes blocks really powerful blobs from entering, battles against the sleepers will always be relatively dangerous affairs. A "griefer" who disrupts the operation by ambushing the logistics ship in the middle of the fight will likely cause the loss of the entire fleet. People are already posting videos of this type of stuff and cackling with glee over the resulting chaos.
But let's put that aside for a moment and assume the pirate/griefer activity is minimal. Is the reward for sleeper loot sufficient? There is a long list of time consuming tasks involved in putting together a gang and running a successful mission in wormhole space. And many gangs are discovering it can take 4-6 hours of real time to find your way back out once the wormhole collapses. Not to mention you may come out on the other side of the EVE universe in the middle of hostile null-sec territory, making it very difficult to ever get back home with your ship and loot.
It also appears that Gallante players are at a huge disadvantage because of the inherent vulnerability of drones. The sleepers pop them almost at will. And it goes without saying that if you lose a boat full of drones, the mission isn't going to be a profitable one. Of course, a lot of people are losing their ship in wormhole space as well, and that's something you rarely see when doing missions.
All of this makes me wonder whether wormholes will become like level 5's once people realize that wormhole space, while cool and interesting at first, just isn't worth the risk and time involved. I don't have any stats to make a definitive comparison, but I'll bet level 4's are more profitable as a general rule. And that should not be the case. If wormholes are going to be this dangerous and time time consuming to explore, often stranding players on the other side of EVE even when they do survive, then the rewards need to be something really worth it. Otherwise, I predict the activity will gradually taper off and people will simply return to business as usual.