For the OP -- there was already a poll / thread on this subject. The results were firmly opposed to multiplayer (58% opposed, 41% for). See http://forums.obsidi...e-stretchgoal/.
58% to 41 for is not firm opposition my friend - that still is very much just a divided community- and it especially doesn't represent the rest of the market that could potentially buy this game. Unless we're limiting this game to JUST the people who use the kickstarter, we can't ignore that having the option to play with friends will mean alot more sales, and, hopefully, alot more money for the NEXT game.
If only 58% of an otherwise notoriously ANTI-multiplayer community is all that was opposed? I'm honestly surprised it wasn't 80% with how phobic some CRPG fans are of multiplayer since it was crapily done in some more complex games. Bioshock 2 is usually the best example, but let's be honest... this is nowhere near as complicated as it was for bioshock 2.