... and even so, I've seen people struggle to install them - Scipy in particular - countless times. I'm not sure how easy is easy enough, but it's going to have to be basically impossible to screw up.
And I'm not sure that's possible short of bundling everything with Python, and of course that's a bad idea.
It's even already packaged for many OSes. For example, it comes with OSX(and ubuntu, red hat, etc). There's a 3 click installer for windows.
There are also distributions of python that have numpy(and many other sci modules) by default.