As far as I know I’m only an avid user of delicious, and their new version is turning out awesome, so I hope they will be allowed to continue doing their thing. I’ve looked around for alternatives in the past, but then the only reasonable one I found was Yahoo! Bookmarks, and well… Then I returned when delicious created their new Firefox extension, and what with their new version coming…
In any case, I wouldn’t expect drastic changes in the coming year/two years, as it really takes a lot of time to digest a company of this size. And the big services will most likely not close out :)