I actually think the new music works quite well with the atmosphere the original had. FFVII makes me think cyberpunk, and the metal music works IMO. I think Crisis Core did a good job of retaining the nostalgic feel and atmosphere of FFVII whilst adding in new game mechanics and improvements. And some of the best games Square Enix has released this gen have been the superbly done remakes. So I respectfully disagree, it could be a big mistake and it could turn out terrible, but I think it's more likely to turn out well.