When will 3DS owners migrate to Switch, and in what capacity?

[Pemalite]

Price is what makes it attractive for parents buying for kids. - The 3DS probably has a few years of life left in her still.

For me though, I won't buy Switch until Nintendo releases a Switch TV or something that ditches the display, joycons, dock, battery and sells it at a lower price.

Or takes it in the opposite direction and makes a Switch XL with a larger, higher quality display, larger capacity battery and such.