I don't think any of those reasons are 'right on the money' so to speak. I tend to look at this like a kid with a new toy. I just watched the Making of Jurasic Park and what they did with CGI and models. It's trully remarkable what Speilberg pulled off. I think that Lucas was just taking the next logical step but he took it too far. The over saturation of CGI in TPM and AOTC has taken the place of a good story with good acting. Granted, I've never thought that any of the Star Wars films were masterpieces in acting, but compared to the prequals, the original trilogy is hands down better acted and a better told story.

I also do believe that reasons #1 and #2 both are playing a big factor in all of this.

I'm still holding out hope that ROTS will bring the prequals to a great finish and in the end it may all make sense.