1) How will we prevent lock-in by vendors when they start patenting and copyrighting schema, etc?
2) Why do tech companies assume that users will gladly trade in purchased software, where they can use it as long as it works, for the vendor wet-dream of subscriptions? It may make sense in some cases, but it's plainly not in our interest in others.
3) Privacy seems to be an absolute afterthought. What will protect us? (Different from the security issue, which is more fundamental.)
4) The copyright owners, i.e. Hollywood, loathe peer to peer technology, a key part of Web services. Could they stomp it all out?