yes there is a new business in town that rents segways.
I agree that there should be no wheeled traffic on the beach (except the designated road in Boca Del Rio.) This includes segways and bicycles.
If tourists are aware that it is unacceptable behaviour 99% of them will understand - but as Diane has pointed out, there must be a passable alternative.
In my neighbourhood we do our best to keep the road maintained and attractive.
Of course a segway is a vehicle. It has wheels and a motor. I think it is a nice novelty and again, most riders are respectful.
But I think the only way that segways will be banned from riding on the beach is if bicycles are too.