The claim that it would be possible to make a new and better game with today's tech is laughable for two reasons. First and foremost, it's a completely redundant argument. Of course it's possible to make a better game with today's tech. That's pretty much the nature of the gaming industry, and really, technology in general. If I spent all that money to buy a Wii just to find out that the games on it weren't any different than what I was playing on my old N64, I'd be pretty fucking pissed off.
Secondly, it implies that the original game's faults lie solely with the tech available at the time of it's release. Might I remind you that Snap was on the same system as gaming legends like The Legend of Zelda: Ocarina of Time and 007: Golden Eye. Not only that, it came out after both those games. I'll tell you this right now, if they did release a new Snap game, with better graphics, more Pokemon, and more maps, but keeping the same "It's a Small World" gameplay, I'd be making the same comments.