I don't know if there is hope for him, in any sense that he'll just start using the scientific method to evaluate information. Some people don't even know where to start evaluating, some don't even want to know. Wishful thinking is really more fun than reality (although I personally & oddly prefer reality).
I did an experiment on my own classmates. Our teachers would read us emails, and told us we should research stuff like that. So, I researched the emails they read to us on snopes and 'break the chain', and found them (unsurprisingly) very bogus (don't freeze water in plastic bottles, aspartame causes cancer, etc.). I thought that was what my teachers wanted me to do, but they quite often had arguments against what I found (saying aspartame is not "natural", so even though you'll find "natural" methanol/formaldehyde compounds in fruit, it won't cause cancer/Lupus like aspartame will). So, I stopped arguing with them, as they will be evaluating me for practicum postions, etc. But, in the mean time, the other students had learned how to look things up. So I sent them old emails on other myths (sodium lauryl sulfate, antiperspirants, etc.). I guess I caused a panic... ooops. I'm not exactly sure how they feel about me, but uh, I'm not feeling the love
So, if you can sneak in what you can without making yourself enemy #1, then you are doing what you can, where you can. That's admirable. Sometimes I just don't know if I should push it and create problems for myself. Nobody likes a know-it-all, and nobody likes to be shown they are wrong (unless they don't really care-and that would be awesome).
It's a prevailing issue among "skeptics". How far can you push the issue without causing yourself more trouble than it is worth? Do you want to be viewed as the "close-minded" one?
If your friend is still open to talking to you (as some of mine are after I debunk things), then there's hope that you won't piss them off so much that they stop talking to you at least. As for getting them to stop believing in things like the secret altogether, then you're probably bashing your head against a brick wall for nothing.
For now, you can show him that the secret's "experts" are out there, and that it's their opinions and not facts that got them as "experts". These experts are trying to show "something is out there", but failing.
John Hagelin's bouncing "fliers" are not levitating. All the wishful thinking in the world won't get you a brand new car just sitting in the driveway with a wrapped key in the mailbox. Somebody has to make and then buy or win the car. Chances are that if you do enter a draw and wish to win, that one time you might. However, some people want to feel they are in some control of situations like that, and a book is telling them that they can be.
Are these people dumb for believeing that stuff? Most people I know that believe in weird things are not dumb. They just want to believe, and latch onto things that confirm or endorse those beliefs. Some more than others may even accept that there is no basis for them, but it is what they feel is part of them. So, we must accept that everyone is different. Just be glad if you aren't ostracized for pointing out that there is another side to things. I like peppermint ice cream, and others hate it. Some people want to believe the impossible is possible.
As long as your friend isn't rejecting getting a broken bone set because he figures the universe will heal it perfectly as it is (all crushed into splinters and gangrenous) with wishful thinking, then view the conversation as fun. Don't view the conversations/arguments as a goal to change your friend's way of thinking.
The best part is when you can have those conversations and still part friends. Agree to disagree, and one isn't making the other feel as though they are completely stupid. I hate it when someone tells me I'm a moron for not believing their pet belief, and they hate it when you tell them they are stupid for believing their pet belief. Live and let live. C'est la vie.
I only wish more folks could just accept differences and not push their point of view on others in a way that tells them they are stupid and wrong just because they don't agree (or kill each other over simple differences in points of view).