If he wants to role play blockading a system then I see no harm in it. He will still get bounties for attacking players or they can simply go solo/private and avoid him. From his perspective there are no visible invaders so everyone wins.Do you seriously believe you can keep people out of your system? Do you even know how the instancing works here? I bet you there are a LOT of other people flying in and out of 'your' system (what a joke) that you never even see even though they are sitting right next to you on 'your' landing pad. You keep trying to lock people out of content, while i giggle at your vein efforts.
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Personally I think solo/private groups should not be able to interact with the same commodity/influence system as open play as it can be used to circumvent player actions like this which isn't fair.
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I had two players order me out of the system and I took great pleasure in hunting them down separately and kicking their bottoms after they ganged up on me and killed me the first time.
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After chain interdicting one of them 3 times he got the message and left "his" system