Every Switch will be able to Switch. There's a difference between the 3D on the 3DS - a minor enhancement to existing experiences - and the Switch's ability to be on TV or handheld, which is literally the cornerstone of the design, the marketing, the brand, and everything surrounding the brand.
In fact, I don't think there will be a Switch mini but rather a Switch Pro that is more powerful, around 2020. New 3DS has been a bigger success than 2DS, though both have made some money. So I think they will want to follow up on that concept rather than the 2DS one. Also, the Switch concept is the cornerstone of the hype that surrounds it while the 3D always took a back seat to every other feature of the 3DS had and many actively complained, including medical concerns.
So no, there won't be a handheld only Switch.







