Odds of Getting In
A lot of becoming a tea plantation owner is out of your hands. Like seriously, in most countries, the tea plantation model really hasn't changed that much since nineteenth-century colonialism. If you weren't there from the beginning, then it's hard to break in. Just think of the numbers. A plantation employs thousands of tea pickers, but only needs one owner.
So as a consolation prize, you could become a tea picker. That is, if you really wanted to cozy up to the Camellia sinensis and didn't care about medical insurance or, um, poverty. Alternatively, you could grow your own tea in your backyard and just call it a "plantation." Free of charge, free of human rights violations. It's a win-win all around.