So given all the information, perspectives, history, theories, ideas, ideology's, etc... Does anyone think Obama will legalize or decriminilize marijuana?

I don't think he or the congress will make a move to do so until more states vote to extert their rights and make a vote to do so. Only then will the federal government change the law to avoid confrontation when one case by a federal agency goes to the supreme court of either that state or the U.S. Supreme court and is struck down. That will set a precedent and eliminate the federal law altogether. A smart fed govt would see the cost of enforcement to be a waste and cancel any funding and put it in a more intelligent place like perhaps maybe education, extra pay for our troops and quality services to them and our vets, and focusing on other cost cutting ways to let the people be represented honestly, like maybe term limits, limitations on candidate budgets so everyone can have a say or chance instead of just the elite (the wealthy) in an election, protecting our borders, illegal immigration, etc....