ODU engineering alum here. Just needed to point out ODU engineers did not build that track/train. It was some company I think called American Maglev Technology from Georgia. They said they knew what they were doing. It worked on the ground, where they tested it. But once they elevated it, it didn't work and they couldn't figure it out. Then some ODU engineers actually started to work on it after it sat there for a few years doing nothing. They have it "working" enough that they use the track as a test track for companies building maglev sleds/trains.
http://en.wikipedia.org/wiki/Maglev_(transport)#Old_Dominion_University
WRT Busch Gardens, a Maglev system would be extremely costly. Especially when there's no operational Maglev system in this country yet.