It's cool and looks fun, but I can't imagine people doing city tours or Mall security on it - that is, it's not in the same market as the Segway.

This similar idea, though:

http://www.youtube.com/watch?v=Gm_2PnSkWck

... maybe. Looks a bit wobblier, but look at it in context - they are on a cycle path and they fit in perfectly well. Someone on a Segway would stand out quite a lot.