Considering everyone just thought it was a generic Gears of War, I don't think losing its' exclusivity is a big deal.
Unless of course you're one of those people who thinks it's so much better than what it's ripping off (ie Dante's Inferno vs. GoWIII and inFamous vs. Prototype)
Edit: Meaning that if PS3 fans start hyping it as better than Gears.....well...just stfu before you even start