How is this going to be good for Bolivia's economy?/How will all of the profits from the oil fields make it into the hands of the employees and not Morales and his cronies?
Mexico has had its oil business nationalized for years. The money goes back to the country and its own economy, not the leaders. It's the same thing here. Bolivia doesn't even sell natural gas to the US or Europe, since it's landlocked and has no pipelines to the ocean. It can only sell to the neighboring countries. So why should a bunch of American and European countries be running their natural gas industry? The people of the region should be the ones doing it, rather than have their natural resources plundered by wealthy foreigners.
And we see how well Mexico is doing with all their oil money, right?
Nationalizing an industry hurts that industry and that nations economy (which is one reason why Socialism doesn't work).