I'm fine with having a retina display and toning down the resolution when playing graphically intense games. However, I really don't want said games to look "fuzzy" or "blurry". Those who have iPhones and iPads with retina displays will understand that older apps not optimized for the increased resolution look relatively fuzzy. I'm sure you'll be able to look past it but still, a 2880x1800 display on a 15.6" notebook has yet to be done so I guess it's all speculation about what certain programs will look like. Also, for those boot camp users/gamers, what will Windows perform and look like with a retina display? I personally don't want to wait many months for Windows to become optimized for the increased resolution.
Still, a retina display would make everything in OS X look phenomenal.
A thing to remember, when someone develops something for an iPhone or an iPad, they only have one resolution they have to program for. However, computer programs don't program only for Macbook Pros, so you will have the same upscaling that is taking place.