I'm curious about the people who think there should be no 'end game'. Surely after you've finished the campaign, you feel attached to your characters and would like to do more with them, no?
I'm not sure what EG would look like with a game like this, but historically these games don't have end games, unless you call Expansions or Part 2 or 3 etc part of that. MMO's created this end game situation because they wanted you to keep soaking dollars into playing. I'm not really against it, I'm near certain it isn't coming, but it isn't a staple for cRPG's in any way. The mod tool is probably our EG, wherever that may lead.
