The other possibility is that the iOS 7 version of Safari has problems with certain websites. Personally, I use a very limited number of websites...and with those, I don't see a problem with Safari. However, once you consider lots of people, it is very possible that some people are using sites that Safari is having problems with...and since iOS 7 is knew, people don't know where the place the blame (not saying the problem isn't with Safari, but it gets confusing when you have many variables that impact the problem).
Anyway, you guys can track the crashes to websites? Then stop using that site for a while and see if crashes reduce in number or stop. Find another crash, temporarily stop using another website.
That's all I got.