Honestly, I think they should reduce lag by taking out the caps from the game above freighters/jump-freighters. The "I have been playing for years and need another bigger badder ship to abuse the noobs (anyone not having played as long as I)" should have it's limits. Whats next on the drawing board above titans... death stars? "Check it out, stations that can move around the system and cyno jump..."
Take away all but dreads (or reduce POS structures to be BS killable within reason and take the dreads too), and then zero zero space becomes more cooperative to get things done. Doomsdays weren't the pancea for blobs the devs thought they were going to be. By all means, introduce more T1, T2 and T3 ships, and eventually T4 and T5... But keep them to battleship and smaller.
Also, something needs to be done about the idea that there is an endgame. EVE doesn't have one specific end game. There is no checkmate, game over, we are done here, result to achieve. No reset the board and try again so we can choose different endgame tactics. EVE just is. Whatever you want to make of it while playing. If you get bored with one path, try something else in the game that tickles your fancy. I'm not trying to diminish lag as a problem, or to demean any particular play style. But really, there isn't going to be a new instance so there isn't an end game to this, just "what's the biggest ship I can fly to do the things I like doing".