I had explored it sometime back it seems like a better option to Metropolis/MP3 for those who prefer bikes, need assistance with balancing and don't mind the premium. But it isn't available where I live(importing vehicles is huge pain & cost-prohibitive).
Not really sure about Abhishek, but based on thr name he's an Indian and I'm fairly sure that Niken is
A. NA in india
B. Too expensive
C. We get conversion kits which can add two side wheels as a rear wheel/chassis attachment which many handicapped people use here in India.
Rumor is that Mahindra is going to introduce Metropolis in the price range of 2.5LacsINR to 3.5 Lacs INR (~5000 USD), Not sure how they are going to manage that(possibly eyeing police force) but at that price it's going to be a deal and unlikely to be matched by other 3-wheelers currently in the Intl. market(In terms of price).
Self-balancing e-bike could be helpful in more than one way to those with disabilities, Considering our travel range is on average limited to those without physical limitations I would be happy to charge my bike at home without awkward petrol(gas) station visits.