Unfortunately, as I believe was mentioned in one of the DoubleFine videos, 1-2 million isn't going to impress the big publishers. They're not going to feel threatened or decide there's a worthwhile market. They'll glance over, say "oh, that's cute" and go back to spending over a hundred million on the next Call of Duty.
But, you're missing the big picture. What-if W2 sells a billion dollars worth of copies after it's finished? Then the big publishers might take notice.