SE’s biggest problem in entering normal stock market via IPO is the potential lost of its social aspects, values and impact. However, the stream of IPOs issuing super voting shares / super majority control by Google, Linkedin Groupon and Zynga and now Facebook seems to suggest a strategy out of this dilemma. Not sure if legally such actions are possible else where though.
NOTE: inspired by TechCrunch’s http://techcrunch.com/2012/02/11/mark-zuckerberg-dynasty/