There is usually a big boost at the end of a Kickstarter campaign. They usually have a large immediate surge of backers that petters by the time the first week ends, followed by a long slower middle stretch, ending with a final surge as the deadline approaches. Most Kickstarters that I have backed or followed have had this pattern.
On a psychic level, the game is funded and already guaranteed to come out. Now that we know it's being supported by Sony itself, there's not much of an impulse or personal sense of ownership (as silly as that is) over the game's success like with other projects.
I'm one of those guys who didn't play Shenmue but is keeping an eye on the Kickstarter. If it's just short of milestone a day or so out, I'll probably throw in to help out. Some things are just worth being a part of.