There's a lot of commentary of what may happen. LinkedIn could be at the top of its game now, and not much room left before it hits a surface level. The next LinkedIn could be around the corner and lead to its downfall.
Many are claiming LinkedIn is quickly losing its authenticity compared to what it originally was. It's becoming overly commercial and spammers are rampant now unfortunately. Usability isn't crash hot either, so that needs work as it becomes a much more noisy space.
Having more connections than the next doesn't really mean much if there's no substance to them.
Maybe Microsoft can create deeper linking and collaboration between Skype and LinkedIn ? Not sure if that is good for business, but it relates to calling and business contact lists / profiles. Just a blind prediction really.