I'm actually keeping an open mind about the bracelets...for a few reasons.
I already take full advantage of the KTTW, and I don't like to carry much on the Parks, especially in terms of wallet type items. I keep $100, my photo State Issues ID, and my KTTW. That's it. Most of the time all I use is my KTTW, for various reasons.
Having done Universal, and even Disneyland, where the Dining Plan cards / tickets / etc are not unified, I love the KTTW.
That being said, I have lost items on trips, as they slide out of pockets, etc. I lost a camera (which later turned up) on my 2012 trip. If the bracelet isn't overly obtrusive (which, the big red version I've seen pictures of just looks uncomfortable...so I'll pass on that), I rather support the idea, at least enough to give it a try.
As long as cards are an option, I'm happy with the current state of things.