There is a lot of things that they can do that doesn't involve ditching p2p. I've pm staff linking to step by step methods of how a lot of different cheating is done and submitted tickets. I guess we'll see how important it is.
Manipulating the market is pretty visible and risky. And giving yourself more cargo than you purchased doesn't work because the adding and removal of cargo is synced from server. At least according to the cheaters.
I seem to recall that the cargo synch to the server was done back in the alpha, when the first hackers disclosed themselves. FD apparently did some stuff then to obfuscate the data held in memory to make it harder to hack. So I find all this talk of very easy hacking most strange. Did FD simply take all that stuff out? Was it not really effective anyway? Did they forget the message they had learned? Are the hackers exaggerating the claims of what they can achieve? It all makes very little sense to me.