You guys have no hope for the handheld devices we are using in 6 year's time. 
lol Man, Who caress about 6 years, the future is today. I have a year old Xperia Ray, 1Ghz in the box, I OC it to 1.6Ghz, it has 512MB RAM and 512MB graphics Adreno GPU.
Now, if its OC'able to 1.6, I'm pretty sure, the ones with quad core processors like Note 2 and Gal axy (forum sensorship -.-) S3 must be OC'able to or around 2.2 Ghz and newer phones also have upto 4GB RAM.
There ya go, your handheld gaming PC is ready ^
But
GTA IV is an abortion, there's no fixing it once it has been so ruined.
is right ^ RockStar has a trend of screwing up coding of GTA games too bad :/