Contesting inventorship via interference

From Patentbarquestions

I suppose they didn't have much chioce other than to extend this program to large companies, since the patent application backlog has reached critical mass. But won't the big corporations be able to game the system by paying for initial BS applications and then withdrawing them, just to speed approval of their real patents? Has the USPTO come up with any safeguards to prevent this kind of thing, or is this one of those things in that we will just have to deal with?