This is the point that I disagree with, and you have completely failed to address the point I'm making. I will restate it, for clarity.
- The "ganker" chooses the system they want to "gank" in (probably a high-traffic system)
- They scan ALL the ships in that system (let's say there are 10, mixture of NPCs and 1 or 2 CMDRs)
- "Ganker" chooses NOT to attack the CMDRs currently in the system (maybe they are also "gankers", maybe they are just not interesting targets), so they sit and wait
- Another CMDR enters the system - they begin scanning all 11 ships currently in the system
- "Ganker" sees another ship has entered the system, scans it, discovers it's a CMDR and launches an attack.
You must be able to see that point 4 will take MUCH longer than point 5 to carry out, thereby handing MORE advantage to the attacker.
In addition, the newly arrived CMDR has no way of knowing that they are being interdicted by another CMDR, so fights the interdiction, loses and get blown up. If they had seen the "hollow blip" moving into position behind them, they could have taken alternative action, or submitted, greatly increasing their chance of escape.
Beating an NPC at the interdiction minigame is trivial in an AspX (for example), so I will always fight. Against another CMDR, I will always submit. You may choose differently, but that doesn't mean you're doing it "right" and I'm doing it "wrong"
In my experience, this is simply not the case. Whilst there are often "gank" wings, I have encountered far more solo "gankers" than wings. I have also encountered far more "non-gank" wings, than "gank" wings, so this point is moot, from MY perspective.
You CAN still meet the blocked player, but it is considerably more likely that you won't. As Sandro stated, it's really only defeated by the "friend" function, so more of an edge case than the norm.
Ultimately, as most people in this thread have pointed out, your suggestion would be FAR more useful to those wishing to "gank" than those wishing to avoid it. Your responses to these people (including myself) stating that "this isn't an issue" and "people can easily spot a gank build" have done nothing to convince me otherwise.