^Look, if anyone other than David Arnold does the score, it will be a big letdown. He is the heir to John Barry--he captures the style and essence, while still making it appealing to a "modern" audience.
As for the title song...I say it's high time we go back to the "jazzy" style of the '60s Bond films. If not Shirley Bassey--at least someone to emulate that style.
(Tragically, Amy is no longer with us...but you get the idea.)