I have been getting the impression rails is on it's way out. It'd be neat to see this abstracted to apply to django too.
It wouldn't surprise me if most of Heroku's technology translated to other stacks easily.
I agree though, I think the "This is the best thing since sliced bread" phase is over for rails.
My point is this: some people look to TC as an authority now and when the articles and comments reflect one perspective on something it's going to sway some people.
Don't get me wrong, I like Rails and it's a great framework as long as you keep in mind its warts, but there was a period of about 8 months where Rails was the Second Coming of Christ in web app framework form...