Given that there are 55 systems and it's easy to earn credits shouldn't we be seeing PvP Open Arena everywhere already if we don't disagree with you by your logic? I've been playing Open almost exclusively since there was a choice and have seen no PvP action. By what mechanism will it turn into a PvP arena with 500 systems if it hasn't turned into one with 55 (never mind billions when they're opened up)?
I must admit, I haven't seen much pvp outside of freeport either. I have seen the tears of its victims though (outside of freeport) so it is happening, which is no bad thing IMO.
I also agree the scale of the game should be a massively diluting factor to this. Still hard for any of us to know how that will manifest itself, will choke-points or hubs naturally develop for example?
I guess I'm sceptical we will find people taking the unnecessary risk of, for example, hauling millions of CR of goods in a Lakon-9 in open, when they could do so with substantially less risk and no downside in solo. (that is how the mechanics work today, I know this may change).