rapidshare is not going anyplace.
this raid must have been a lot of work to pull off. authorities would have first had to go to the RS HQ in Switzerland to get the uploader's IP, then to the ISP in Germany to get the name/address attached to that IP. it only happened because Metallica is so uptight about filesharing, and because the album leaked to the internet a day before it went retail.
i'd estimate that files on RS are 60% porn, 39% music/movies/apps, and 1% legit. they don't go after people's files unless that file is reported - then it gets deleted and they put an MD5 flag up so the file can't be reloaded as-is. RS puts up that notice about copyright just to save their own ass, but they are certainly not proactive about upholding the policy, otherwise they would be out of business.
even if they wanted to check files, it would be a logistical impossibility. i can't even guess how many TB of data are on RS servers. it's uncanny.
anway in spite of this incident, users are at minimal risk, especially ones who have premium accounts but just download - RS insists they only keep logs of bandwidth, not of files downloaded. as for uploads, well files are easy to track, they're sitting right there in a user's account and that account is associated with whatever IP uses it. just watch what you upload, or don't upload at all. it's not like torrents where you have to give in order to get...