I think that have few competitors shouldn't worry you till the moment that delta between your product and your competitors it's solid. I would be even relieved about such a thing. You are not alone betting on this type of market.

Just to clarify the delta point. How can you be sure that the difference between your product and the competitors one is reasonable?

Try to use the product vision statement from Geoffrey Moore’s book Crossing the Chasm. http://elevatorpitchessentials.com/essays/CrossingTheChasmEl... Try to see if your point [5 (Unlike)] is solid enough compared to your competitors. If not, work on it.

I would think twice before to throw everything.