I am really amazed at the kind of things Amazon turns into a service. And this ML service is just wow'ing. I have fiddled with basic SVM's before, but this takes away the part of writing code and makes it sort of a end user product(you are still expected to know basics about ML). On the other hand, I also don't think this will take off very well. Maybe a few companies/startups who have cash in their pocket will use it/try it out, but the audience is really limited beyond that in my opinion.