Hoarding (saving) is actually a good thing. It's what gives a currency its value. If everyone is always spending their money, the money becomes worthless because nobody wants it. So the goal should be to get more people to save, because that increases the depth of the Bitcoin markets, and allows more capital (read: value) to flow through them. Currently the Bitcoin markets are actually rather shallow. They only allow a dozen million dollars' worth of value to flow through per day. With more hoarding, that number can skyrocket to billions of dollars per day. Of course, like I said, you shouldn't hoard 100% of it obviously.