A dockless Switch model would probably be a higher priority than a Vita TV-like variation. It would allow Nintendo to lower the price by 50-75 dollars without much hassle and those that want tv functionality later on could just buy a Switch dock.  At least in that scenario, the Switch model could still be called a 'Switch' since it would still have two modes of play while a tv-only Switch model would lose the entire purpose of the Switch's existence.