They're already cutting back the number of certain types of missions that can be accepted - 3 War-time Planetary Scan missions, 3 Massacre missions (ship and skimmer).
This effectively kills these as a means of making money and Navy Rank.
Where the issue lies though, is in that only 20 missions are sent each Mission Board update, which did wonders for problems like:
1. Mission board time out - when previous a vast number of missions were sent at one time, but could not load in a timely manner. We'd sit and watch the mission board try to load, and it would eventually fail.
2. Mission board takes forever to load - again, like the above, except it would load, eventually.
Now I know just about as much as everyone else here about the Cobra engine, and the inner workings of the mission board, perhaps one or two things more, but the basics go something like this:
[Mission Type Variable] to [Location Variable] with [Cargo Variable] in [Time Variable] for [Payout Variable]
So the system has to run each of these variables, ensure the destination is valid, supply a cargo type if the mission type calls for it, call a time frame to complete, and calculate the payoff - 20 times per mission board.
And we have no real idea how many values exist for each of these variables - could be hundreds, could be thousands, could be more. For each mission, it has to do this, so multiple that by 40 (20 regular missions, 20 passenger missions), and that's a lot of data sifting to go through.
Elite isn't like other games.
There is no real progression, because there's no end to reach.
Sure, you gain ranks in various areas based on what you do, but these are little more a basic label based on the number of times you've done things in a particular field.
And yes, you earn credits to buy other ships - but again, this is not progress, as there's nothing to progress towards.
The closest thing to any sort of progression of any sort might be the Alien Ruins puzzle - though it's also buggy, flaky and does whatever it feels like some times.
The only real "exploit" I can think of is the one that involves other players worrying about what other people are doing.
If everybody simply would mind their own business and stop worrying about what someone else is doing, things would be 1000% better for everyone.
And this isn't just true for Elite, but for life as well.