Will Blockbuster movies now have to compete for space with Blockbuster Video Games?

The article below suggests that the timing of release for Iron Man will suffer from competition with the release of Grand Theft Auto (GTA):

http://www.nypost.com/seven/04202008/business/media_battle_on_tap_107324.htm

This is suggestive of the rising importance of video games as a medium. Will movie studios have to be more careful of their timing to ensure they don't square off blockbuster games?