The suggestion is quite simple: Reduce the number of hisec systems overall in New Eden. This means converting some hisec systems into low-sec and some low-sec systems into null-sec. This should be done gradually, only a few systems at a time, until Hisec space has been reduced across the board.
The reasoning for this? Compress the ‘safe zone’ of New Eden to force more competition between players and give more space for sovereignty.