That's like saying that artists should just give up painting in oils and exclusively use watercolors because "times are changing" and we need to "move along".
Hand-drawn animation is not a genre distinct from CG. It is a medium of expression through which, theoretically, any story can be told.
The medium is not the problem. Disney's marketing and increasingly restrictive creative culture is the problem. Limiting the range of expression available to their artists, by arbitrarily saying that the hand-drawn medium is the problem, is not going solve anything. Disney has deeper issues on the creative side of their business than they care to admit, and this latest move by Disney does nothing to address them, which is bad because all of their movies, not just the hand-drawn ones, will be negatively affected.