Independence of Latin American countries if Spanish Empire uses Bartolomé de las Casas' plan?

If the Spanish Empire adopted Bartolomé de las Casas' plan, that is, settling Spanish peasants in the New World, and giving Natives self-governing townships, then Latin America would probably be higher populated (both due to immigration from Castile, and less disease spreading to Native Americans from brutal conditions) and economically stronger, earlier.

However for the English colonies, it took only 156 years from Plymouth Colony to the American Revolution, partially because the East Coast was settled quickly and became highly populous, able to challenge England.

So if the Spanish colonies become developed countries, with the native population preserved and a large Spanish population settling, would they start negotiating or fighting for their independence much earlier than OTL? Perhaps once each country has about 1 million people? Wouldn't it be even easier to fight off Spain in the late 1600s, than England in the late 1700s?

If Latin American countries did become independent then, would they try to colonize the remaining parts of the New World (such as North America and Patagonia), or largely develop their own settled land?
 
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