Skype has gone downhill ever since their first acquisition, and they've been acquired at least three times already.

If anything, MS is starting to slowly take it to a better direction, even though it is nowhere near the ideology of the original Skype.

I believe that LinkedIn will end up being a similar case, where it will continue to suck, but you'll see some slow progress eventually.

EDIT: As pointed out, LinkedIn will likely continue operating independently, as did Skype, which explains the slow progress.