Django does need a place to store the tickets, and GitHub's tracker... is not great. I'd honestly want to look at adding OAuth or other easier signup/account management to Trac before I'd look at moving to GitHub issues.
Bots that mirror content/comments between the various platforms might be an interesting interim step that could minimize those scare quotes, and achieve many of the benefits in a minimally invasive way.
I'm of the opinion that Trac is probably blocking a number of people from contributing, even if that contribution is participating in comments and voting on issues.
But that's exactly the kind of thing the community as a whole can be empowered to do without the old guard of core vetoing the suggestion outright. The python community are considering doing just that now with PEP 581.
[0]https://groups.google.com/forum/#!topic/django-developers/ai... [1]https://www.python.org/dev/peps/pep-0581/