>>719761637
The biggest issue is writing the code to work with x64 architecture. Yes I know there was a working port that ran on xbox 360 dev kits but just how complete and stable the port was is unknown. From what I heard the MGS1 dream section utilized the PS3's internal PS1 emulator software which would be another pain in the ass to deal with. Also the licensing bullshit as mentioned by another anon.

>>719761951
It's more than just the ipod. Kojima loves putting in licensed products whenever possible. All of that can be switched to generic items. There was the Assassin's Creed outfit, Triumph motorcycles, Playboy magazines, and I think there were some licensed songs in the game. A lot of people would be crying about cut content. Besides even if Konami was willing to pay to renew the license sometimes the companies won't allow it for whatever reason. They would also have to go and rerecord some voice lines or awkwardly cut them out.