There is nothing I hate more than people guessing how a game will run based on how a game released in 2008 did.
Well, how the forget are we supposed to know? People are guessing in the same way you guess what your Christmas presents are, or you guess who you think will win in a race.
Previous instalments and other games give a good indication into how this new title may have been developed. We can absolutely say without a shadow of a doubt that Rockstar don't understand how to properly LoD their world map, and so we can already guess this title is going to be massively unoptimised.
I'll eat my worlds only if this game doesn't cost $120 and is actually decent.
Also, people keep saying "It's naught a pourt!" I believe they're actually suffering from dementia. If Build Logs are to be believed, this has been in development as long as the console versions. This is just getting the tweaks from the XOne/PS4 ports.