Depending on how long they would be isolated.
Central american powers were starting to play with the Empire idea when europeans came along.
They might have had a Genghis Kang sooner or later.
Also contact by trade would have been almost as lethal as the conquest. Remember that most death were because the diseases the europeans brought with them.
The fact that many people pay a little for something is not an excuse to waste that money. Quite the contrary, if you are taking everyone's money to do it you are obligated to do it right.
What I want is that education money te be well used.