Changing a game like Fallout is risky business. Just ask all the tormented F1 and F2 fans what they thought of F3, or what X-Com fans think of the upcoming X-Com, as if we need a reminder. But if you do, there's still all the first gen pokemon fans who would only be DELIGHTED to tell you what they think of the new Pokemon.
Rebooting old games that people hold in high esteem is a quick way to lose fans. I believe the company who're making F:NV are considering this in the back of their heads, always. Just imagine the F3 fan outburst if they screwed it up.
And it's still a while off yet. I'm sure there ARE going to be a few changes revealed before it hits the shelves. I'm just gonna sit back and wait until I judge it.
EDIT: Crap, I misread the thread. Not deleting this though, I kinda like this post.