Interestingly, back in 2004 when I first joined ajb007, in one of my early threads I suggested Zimmer as a future composer. But over the last 11 years or so, my opinion has been completely changed. I think Zimmer wouldn't be a good choice for Bond composer at all. And I say this as someone who does quite enjoy listening to a number of Zimmer's scores. But they are mostly all the same, he has a few basic ideas which he continually recycles. They also tend to lack strong theme development which I believe is vital to Bond scores (the Newman scores have emphasised this point.) Zimmer's 'sound' has become a cliche, and I don't think the Bond films should make the mistake of going in that direction.
I often feel like I have to be careful though when I speak to Zimmer-lovers because I am always tempted to cite the repetitive nature of his scores as his biggest fault. I say careful because that is exactly the same criticism which was directed at my favourite composer John Barry in the later stages of his career. I just think that what Barry was doing is better than what Zimmer is doing.