Actor Keanu Reeves, known for his roles in The Matrix trilogy, The Devil's Advocate and Johny Mnemonic, stated to Collider.com that the budget for a live action movie adaptation of this anime would cost at least $500 million dollars to make right now:

"I haven't heard anything back. They turned in the script and it was very expensive. I don't know if they're going to…it would cost, like, half a billion dollars to make that script. So, I don't know where it's at right now. "

Even though 20th Century Fox and Sunrise Studios teamed up to make a serious live adaptation, with the participation of original director Shinichiro Watanabe, original script supervisor Keiko Nobumoto and the president of Sunrise Studios itself, Kenji Uchida, it seems the script is too ambitious for Hollywood standards, thus the budget has been set at an abnormally high proportion.

However, Reeves told MTV News last September that writer Peter Craig was rewriting the script. He added at the time that the producers were "just trying to pull it back" in scope.

(source: Anime News Network, Collider and Hollywood Channel)

Do you think it's best if they make no movie at all? O_o  I mean Dragon Ball: Evolution and Speed Racer had high budgets...and look what happened.