Like I said it's possible for Nintendo to merge the two console lines, but for now nothing points towards it. There are literally zero games that indicated 3DS developers transferring to Switch development so far.
I'd definitely agree that Nintendo has not tipped their first party hand but when you consider that Square Enix's Asano team, who have only ever made handheld games and have worked directly with Nintendo are making a Switch game.
I think Nintendo will reposition as a handheld when they can cost reduce to get it to a competitive price.