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Bear in mind that practically no runs are TRULY predatorproof, even though I realize that gajillions of people look at their heavily-wired runs and think "ah, nothing could get through *that*". Browse the "Predators and Pests" section of the BYC forum to see how many threads with titles like 'something ate my chickens last night' involve predators getting into what people had, right up to that moment, been SURE were 'fort knox' type runs. So by all means beef up your run fencing -- even just running 2x4 welded wire mesh over the existing chickenwire would be a really big improvement and probably give you about 80% of the security level you could obtain by going berzerk with expensive hardwarecloth and such -- but I would not suggest letting that lull you into thinking it is "safe" to leave hte popdoor open at night. Of course you CAN certainly leave the popdoor open, but be aware that some predator can probably get into your run (and thence into the coop) if it really wants to.
Good luck, have fun,
Pat