I guess the short answer is that it's certainly not going away - McAf.ee provides the backbone for the SiteAdvisor Live link share service, so it's embedded in McAfee as deep as it could be. Also one of the first rules of SURL services is that they MUST live forever - If for some strange reason we decided to discontinue it (highly unlikely!) we'd migrate the link db over to another provider to handle for us.
I don't see any probability of this happening though, as McAfe.ee is both very successful, and very useful.
If you're intending to use it for commercial use though - please reach out with some details, as there are a lot of rate limits within the service designed to protect it from exploitation - you may unintentionally run into one, in which case the system will automatically blacklist you. We can give your service special access if needs be to bypass these measures.