As I just commented in another thread about a potential sequel, what I am appreciating more and more about this game is how timeless it is.
South Park fans in 20 years or more will still be able to load this game up and it will still look exactly right, not dated at all, because of how much Obsidian nailed the look of the show. They'll probably have to either still have a working Ps3/360 or be willing to do PC workarounds (same way people do today when playing PC games from the 90s), but once they do get it going it will still look just as good as any episode of the show.
And in an industry where our art too often can end up looking so dated to the point where it is unplayable (a lot of Ps1 games out there I used to love but just can't play anymore), that is a beautiful thing.