I don't know about that. When I think to myself, "What has an imperial fucktonne of exploits?" here's what comes to mind:
* Windows (and Microsoft software in general)
* Java (and especially the use of Java inside browsers)
* Flash
* PDFs
* Loads of other proprietary software/solutions
Exploiting the browser these days is very difficult and browser vendors are doing a really good job with competitions/incentives to uncover vulnerabilities before they become a problem. Using the browser has the distinct advantage of *not* having the same problems of the proprietary products I enumerated above. You get whole new ones! But at least they're manageable and (mostly) predictable.
The more apps that are available in browsers the better. They're as cross-platform as you can get right now and if you host them yourself you can avoid the spying problem.