A hacker won't be the first 275.
Nexon has been known to swoop in and remove suspicious people at the top before they reach level cap. It's one of the only times they actually investigate players thoroughly and successfully. Discussions like this have been had before and many have said hackers will win the race but being proved wrong later on.
I was talking about this earlier with a friend and he mentioned that we'd probably get nerfed flames if we kept nebs. Of course if it came down to it I'd prefer flames for sure but I don't see why there's a reason we can't have both without having our flames nerfed. GMS is already OP with the gollux set and SW. Nebs are minor compared to that.
He also mentioned that reboot have a neb problem. They can only get them from boxes and fuse them (correct me if I'm wrong). Removing nebs to replace it with a better system (aka flames) makes sense in this case. However the fix for that neb problem is pretty simple.
1. Buff the drop rate on neb boxes.
2. Remove fusion tickets and allow players to fuse up to A grade.
3. Remove D rank nebs.
This should have been done ages ago but wasn't. This should sort out the supply problem and make nebs more accessible. Of course they'd need to improve fusing % also.