Remember how new committers happen: current committers notice their contributions on the tracker, suggest they be given the commit bit and offer to mentor them, and we take a poll. The critical bits here are (1) noticing and (2) being willing to mentor. So, if we want more committers, current ones need to put forth the effort to monitor active bugs, evaluate prospects, and recommend and mentor them. And hopefully do some mentoring via the bug tracker to get more people commit-bit ready.
This is a catch 22: we need more active committers in order to get more active committers. But we know that; that question is what to do about it.
I the past few years I've monitored the bug tracker fairly closely, and watched for good prospects, and recommended or inspired the recommendation of several. Right now I don't have the time to monitor the bug tracker the way I had been and watch people the way I had been, so I won't be in a position to recommend anyone for the next while....
I don't think any of us truly understand how much time you have put into this kind of behind-the-scenes activity over the years nor fully appreciate how important that has been to the on-going success of python-dev. Thanks, David.
PS: Actually, let me throw out that the people that had been at the top of my list before I stopped were eryksun, paul.j3 (for argparse), and davin (for multiprocessing).
I agree with your recommendations for all three.