Chickens will probably stick around. A German company has discovered a way to determine a chick's gender while still in the egg. That will end the cruel practice of tossing male chicks into a grinder. And will allow cruelty free eggs to be produced. As long as the hens have space, comfortable quarters, and allowed to keep living in those conditions after they stop laying.
For those who are vegan for purely ethical reasons, this will allow them to have eggs.
It's not a good idea to be confident predicting how anyone will see your ethical argument. There's a lot of things people still consider cruel left in egg production after the practices you mention change.
I think the argument is that half the animal are killed, because they are roosters instead of hens. In addition to whatever their living standards are.
For those who are vegan for purely ethical reasons, this will allow them to have eggs.