It'll be down to the price difference between the 2.0 liter and V6, though I assume most people will just go for the former as it still has more than enough power to satisfy the peoples' needs for a daily driver.
I guess it depends and I'm not sure how typical I am. For me, in a car of this type, power is a big part of the attraction and I would definitely opt for the 3.3. Sport sedans with too little power lose a lot of what I consider their essential character. I've certainly found that to be true with BMWs that have had what I consider undersized engines. But for many, the 2.0 will be adequate and the cost savings will certainly appeal.