Maglev smacks of one of those brilliant ideas that yes is feasible right now but no isn't economically viable at our current level of technology. Give it twenty years and we may have found both an economical way to power the thing and a feasible way to build the infrastructure it requires.
At the moment it's in the technology showcase category, along with humanoid robots and monorails. And we all know how well the monorail concept developed....
