I think Star Wars will remain an important cultural icon, like the Wizard of Oz. But in 50 years, I don't think there'll be much new Star Wars content being created. The original trilogy (even ROTJ) will be seen as truly great films, while the prequels will be regarded as mediocre. And we will have the theatrical versions of all Star Wars movies in the latest video standard.

After George Lucas dies (probably in about 20 - 25 years), the Lucas worship will go through the roof at first. His faults will be overlooked much like Michael Jackson gets a free pass nowadays. But in time I think Lucas will come to be seen as an illusive shadow figure, like Howard Hughes. I predict a movie about his life story: The Tragedy of George Lucas.