Now ask yourself this:
If I'm Amazon, and I'm considering accepting crypto-currencies, what am I looking for?
1. Something that is cheap to transfer both domestically, and globally.
2. Something that has near real-time transfer times.
3. Something that can scale to millions of simultaneous transactions and still maintain speed.
Here's a graph that charts all three of these with the incumbents:
Don't take me wrong. I don't love Ripple. I'm completely unattached to any emotion about them. I'm just looking at the basic facts and asking myself which currencies make sense for what applications. For buying a home, I probably don't need a 3 second transfer time. I can probably be patient with an hour transfer time. But if I'm Amazon and I'm taking money for a trampoline that somebody bought on my website, I'm not going to want to wait an hour to validate that transfer. I'm going to look for the cheapest, most adopted coin for that, no?