Like most other perceived issues with this game, combat logging is not an issue to be fixed but a symptom of deeper issues that result in player actions we deem to be disruptive to gameplay. Instead of asking yourself how combat logging is detrimental to the game perhaps you should instead ask yourself these questions.
- Why it is happening?
- What is the driving factor behind the behavior?
The issue is not really about it's negative effect on an aggressors gameplay. FDev all throughout the early development cycle stated that Elite was never intended to be a PvP centric game but a Cooperative centric game that allowed for PvP interaction. But like most similar games a lack of focusing of its PvP elements results in a minority group forcing their gameplay ideals on those with a differing desire. While the OP approaches this topic from the perspective of someone who appears to be above this activity, the vast majority of people calling this perceived issue to light are not.
If you want to reduce peoples use of this tactic then you need to address the reasons they are choosing this action, not try to prevent the action. All preventing the action will do is drive many of these people into solo and group play. The primary reason this activity is occurring is that the penalties for PvP loses in the currently available PvP gameplay within Open are too high when compared to the fun factor the risk of encountering a negative player to player interaction. Most MMO games have a very low penalty for PvP losses, you are back in the action in just a few minutes and any financial hits are easily recovered in short order through normal gameplay.
In games like Elite and EVE the penalty is high and only dedicated PvP players consider the loss acceptable and and a result those that do not either stick to areas of the game where these encounters are less likely. If you want people to remain in open and discourage people from combat logging when combat is not going their way then you have to reduce the penalty for loss or the likelihood of significant loss to levels that these players find acceptable.