There will always be some eccentrics that will still practice the art, just as some people even today will learn Morse code or keep paper maps in their car.
Just about everybody under the age of 40 are highly skilled with keyboards. Soon, you will be able to reliably dictate anything you would normally write or type today as voice input will be perfected.
Most documents will be signed electronically with a fingerprint, retina scan or maybe through facial recognition signature.
The break with the well established tradition may have some upsides but Im not convinced that they equal the downsides.
I’d never be one to insist that everyone use cursive as a matter of habit..but i see much value in being capable using both reading and writing it.