[Bounties giving BGS in the system they're earned would] solve a lot of the imbalance of bounties in the BGS right there.
Though it would make it even harder to attack an established system controller, because you'd be on whatever you could KWS up versus their primary bounties, and you already have no trade or exploration options.
I'm not sure what the BGS needs is
more entrenchment of controlling factions in any semi-busy system.
Combat Elite is the biggest grind...
The point is that it's supposed to take a while to get to Elite. Nothing actually needs you to be Combat Elite, one fairly marginal engineer requires you to be Dangerous (which is much quicker), everything else is basically happy once you reach Expert, and you
can get Combat Elite extremely quickly from Thargoid Scouts if you really need it for something.
(Combat Elite is also a
lot quicker than CQC Elite, which I don't think anyone has got in less than 500 hours - but there's got to be some sort of challenge)
Trade and Exploration Elite used to take longer, too (though, still possible in a week if you went flat out to them) but Trade especially hasn't kept pace with the increase in possible trade earnings over the years.