There's been more than one mock-the-silliness-that-is-ten-share-buttons-for-an-unshared-blog-post blog posts.
The mobile browsers have already shown the way - a single share button, share with any service (yes, there needs to be some open bring-your-own-service functionality like we already do for search).
I'm hoping one or two people who are working on one of the major browsers would read this and "simply put it in" and we'd eventually all be living with a cleaner, faster loading web as the on-page buttons go the way of the dodo.
Not to mention that it would actually be really useful.
On one website that I work on, implementing one of those stupid "like us on Facebook" popups (in the lower right of the screen) almost doubled the number of likes the page had over a couple of weeks.
Now, whether the number of Facebook likes your page has is a useful metric to you is another matter, which is why I put the word "work" in quotes above...