GTA V is already more profitable than Minecraft, even though Minecraft has sold more units across all platforms (http://www.ign.com/articles/2013/09/03/minecraft-pc-sales-at...).

33 Million units at ~$20 is $660 million in revenue. This isn't including development costs, which are low for Minecraft but not zero (I'm guessing $5-$10 million over its lifetime.) Subtracting GTAV's combined development and marketing budget of $265 million still puts it ahead of Minecraft at $735 million, and it still has a lot more runway left.