Lack of standardization for controllers would lead to underutilization of a given controller's featureset in the vast (overwhelming, really) majority of games, so that almost all games would be built to work off of a baseline controller with other formats being a tertiary consideration at best.
I don't think there's any real benefit of a standardized medium as compared to what we have now. Let the people decide what kind of hardware they want, and the fittest will survive.







