Why should language be controlled by central, and private organizations like Merriam-Webster, Oxford English Dictionary, etc.? Language is organic and should evolve with people. What better to reflect that than a crowd sourced dictionary?
Language is not controlled by dictionary writers. Dictionaries are descriptive only, they just list what words people are already using. In some countries, central organizations do try to be prescriptive and decide how the languages should be spoken, but that doesn't usually work.