Reitter: Answering the question: "How do I develop an app for GNOME?"

The decision was made during the GNOME developer experience hackfest. I'm pretty sure that this was documented. During the hackfest people committed to making things happen, plus they actually did a lot of work.

So it was not made in a meeting, everyone who wanted to join could've, the hackfest was pretty widely announced, you could get sponsored to go to the hackfest, people with intimate knowledge about various languages attended (incl Python for instance).

Seems you like Python. Cool. You might want to read Planet GNOME. For instance this blog post by one of the people who worked on the Python bindings: http://www.j5live.com/2013/02/04/gnome-and-languages/