I have just one question: why? If it ain't broke, don't fix it. There's absolutely no reason to do this unless they plan on making it significantly different from the original.
That's the reason to do ANYTHING in Hollywood. And in this case, I'm GLAD they see $$ potential in the Rocketeer. I LOVED, ADORED the first movie and was disappointed it didn't do better. So, I look forward to this new one. Hopefully it will be similar in spirit.
And there's a a big difference between THIS remake and the Amazing Spiderman... 21 years difference.