That's already the plan. IIRC the plan is to have a bounty right now, which, when clears, turns into an no time limit fine. This fine would have to be paid on rebuy, so if you dock somewhere you have an unpaid fine, that'll make your next death rather more expensive.
Their plan for the next iteration on bounty is still broken, makes being an outlaw for many players even less interesting than it was before and comes with an super unintuitive interface too. Furthermore it keeps the ludicrous low bounties for killing other players, so overall nothing changes except that we get soon some more complains about players who got back to their sidewinders because they were surprised by their dormant fees on some backwater outpost from 3 months ago that became active when they docked again at the station and got blown away for the lolz by a friend.
Do I sound as bitter about frontier as I do feel about them?