I would love vehicles to be in Fallout as long as the world is big enough to support it, as long as they don't handle like crap and as long as it doesn't turn into GTA: Wasteland Edition with a racing quest every 10 seconds.
Though this thread should be in Series: http://www.gamesas.com/index.php?/forum/34-fallout-series-discussion/
I agree about the racing "quests" crap, I strongly dislike being competitively timed in any game. If they do add vehicles it should be a motorcycle, and then later for more
money caps: a Highwayman.