That's a great observation.
I think the issue here is a matter of taking a series of calculated risks. My personal opinion is, at this point, any progress is better than no progress. We can have no "assault" pistol (worst misnomer ever) and be angry about not being able to have it. Or we can push to be able to own and use them again, with the compromise of a charge, if it has to be. Some years down the road, when everyone can't immediately recall the feeling of not having the choice of owning and using it, we can be angry about having to be charged to excercise the right. Then push to get that removed.
Even if the push to remove the charge fails initially, we'd still have the choice to own and use what we want. Which would be light years ahead of what would have happened if nothing had been pushed in the first place; which would be nothing. Same place we've been for years.
As for the question of what I think the chances are the government at it's current state, or politicians worried about their own careers, will abolish or repeal anything regarding "assault" weapons, my answer is - extremely small. I agree we have little chance politically. Liberal Hawaii will not voluntarily budge on the "assault" pistol issue. Though we have experienced some victories politically the last few years, which is great.
The legislative weather has been leaning toward the Constitution and restoring rights on the 2a front. After more pass, it would be a matter of wrangling Hawaii into compliance and reminding them they can't pick and choose to grant which Right and which exclusive club to grant it to.
Ideally, abolishing the ban on "assault" pistols from the get-go is favorable. However, I think that's one giant leap we're unlikely to win. There would probably be less risk and better outcome by taking a series of likely-successful moves.
I'm not actively doing anything but speculating, but this is just my humble opinion.