I like this idea, honestly. Warframe is a power fantasy game, and the warframes themselves lend a lot of that power to the fantasy. Nerfing them in PvP goes a long way towards removing that fantasy, and thus feels "off" compared to the rest of the game. Better to just not. This idea, or something like it, would allow those who want PvP to experience the thrills they want without detracting from the feel of the rest of the game.