I actually think capital would genuinely be good with Yglesias' One Billion Americans idea. They need to continuously show not only profit, but increasing profit, or the system collapses. Since we know that the rate of profit tends to fall, this is a contradiction that capital must continuously fight. Most of the easy gains from technology have been absorbed and the global south is already highly exploited. They'll have to resort to either slavery or importing people into the imperial core to boost sales and profits.