Should it be a major part of endgame? No. But should people be able to have the option for pvp content for either fun or even for setteling player to player or linkshell to linkshell disputes? Absolutely.

Saying no to PvP being a large part of the game is something I am behind. Not everyone likes pvp and should not be forced to take part in it. But to say that there should not be any is rather silly. Why do you care so much if people are given the option to knock each others skulls in? You never have to participate. I personally would like to have the chance to test my skills against another player, even though it's not typically my favorite thing. It can be a fun distraction from the main game. And besides, just offering it can not only boost the audience interested in the game, but affect how long they stay with the game, because with pvp, it's like a never ending group of bosses.