YouTube will no longer support Internet Explorer 6 Microsoft's starts from 13th March.. so this will make people to update their Browser or even change it with another browser that available on internets

From that day onwards, if IE6 users visit YouTube then following message would appear:

On March 13, we are dropping support for your browser. You'll still be able to watch videos after that date, but new features may not work properly.

Users will also be provided with alternative browser version newer than the leading provider of browser technology. The recommended options include Firefox 3.6, Google Chrome 4, Internet Explorer 8, Safari 4, and Opera 10.