You think that letting employees wear what they want with a shirt is going to be less hipster than wearing uniforms?
Uniforms are an integral part of the professional workforce. For many of the people whom are employed by McD, it is their first foyer into the professional world. It instills professionalism and holds people accountable. Letting them do basically whatever they wanted in such a global establishment would be a total mistake. Adhering and abiding by the uniform code is an important function of the job.
Yes, I'm sure businessmen will start closing multimillion dollar deals at McDonald's now.