Well it's a "hell no" for me. We would be giving up a whole lot more than just ESB & ROTJ just to rid ourselves of the prequels & SE. Think of all the other movies and TV series that we would lose because the FX industry hadn't progressed far enough to make them possible. If only Star Wars existed the ILM may well have disbanded and certainly wouldn't have had the money to develop all the new techniques that gave us today's FX industry. Can you imagine what LOTR would have looked like having to use stop motion animation?

But FX aside just think of all the fan edits we would lose and this site wouldn't have existed in the first place for us to debate a subject like this.