Stallman is being silly again. The cloud is like a giant parking lot for data. If you leave your data unlocked, of course someone will steal it. Encrypt everything, including the unimportant, so you don't need to remember what's encrypted and what's not. Route your data through anonymizing servers, even your Amazon transactions.
Everyone needs to use encryption, not just the political activists and child pornographers. You have bank statements and health records to protect. No one needs to know what you buy but you. If the world knows what you buy and need, like your collection of garden gnomes, the price of garden gnomes will go up.
Just because you encrypt everything does't mean you can't share. Encryption keys can be split and shared. Some people are working on anonymous group keys so you can subscribe to the online New York Times without getting spam from 3rd parties. I know one fellow who encrypts his Facebook postings with his private key. When I want to read what he has to say I decrypt with his public key. He can use a shared key if he wants to communicate with a particular group of friends.
As for the threat of quantum computers -- its true that quantum computers can factor billions of times faster than conventional computers, but all that means that the average time to break my key has gone from billions of times the age of the universe to merely the age of the universe. I'm not worried yet. I note the U.S. military recommends 1024 bit keys for secret data and 2048 bits for top secret.
Stallman got one part right. You can't trust commercial operating systems. You need to be able to see what you're running to trust it. We don't have a secure cloud because commercial interests aren't concerned with your privacy. They want to track you so they can sell to you. They have not realized that if they are tracking us, they are being tracked. We don't have a secure internet because big companies don't want it. You need to do it yourself.
Encryption is the infrastructure for this century. Use it and insist that others use it.