The labour share has been roughly at 60% +/- 10% for ages.
Even getting 100% will be at most a doubling of labour's income. That's nifty, comparable to moving from Mississippi to Connecticut. (https://en.wikipedia.org/wiki/List_of_U.S._states_by_GDP_per...)
But it's one-off. The difference between countries are bigger. And so are the difference over time.
And of course, jumping to 100% while keeping total GDP per capita constant is not really possible.
