Here we go again. Guys, if you want to rewrite the rules of the game you'd better have a good reason. "I just thought it might be gud kk?" is not a good reason.
PS wars were a direct result of how ridiculous pre-nerf Nym was. You just needed PS11 (or PS10 with a solid bid) if you wanted to stand any chance of winning with non-turret high-agi fighters. FFG applied the correct solution and simply nerfed the offending ship.
When we begin to see PS10+ ships dominate the meta because their high PS gives them an insurmountable advantage, we can start talking about caps, limits etc. Until then - very high PS ships were a part of this game since the very beginning. Not once did this lead to meta getting skewed in some terrible way. In fact, PS10+ helped to curb some of the worst excesses of Whisper at her prime. So, can we please not try to fix non-existent problems? This tends to produce very real ones down the road.