I do not know what was the real reason behind the ‘scarcity’ approach, but looking at player numbers (about 15 000 against 22 000 average before scarcity) and amount of PvP actions I can say it produced negative impact on PvP part of the game. You have way less targets because people do not want to risk overpriced ships/modules.
I believe last move, that really supported PvP side of the game was when CCP removed losing of the skill points if your clone was destroyed. Nothing since helped PvP at all. Abyss arenas could be move in right direction (find battle quick between kids go to bad and wife want to socialize with you) but with very few option to earn ISK for not that cheap gear the game start to be really expensive even PLEXing your way to fun.
I suggest to drop prices for non-capital ships by introducingh expensive material to build capital ships and make material to produce T2 gear and non-capital ships much more affordable. Prices go down, more people will dare to go pew-pew (even carebare will go if all he loses he can mine back in a day or two in high sec). Capital ships remain rare, PLEX prices will stay inaffected, fun will increase.