I wonder if threads like this keep popping up if people will say "Fuck it" and build an OSS Github clone that focus on being the Reddit of Code/Git rather than another Version Control Enterprise product.
I'd do it but I'm an asshole, not a community builder.
EDIT:
Since I'm in the edit window and its complaining I submit too fast:
Tbh, the problem with Kallithea SCM and Trac is they aren't really built to generate network effects. They both suffer from the same problem as literally every other unsuccessful Github competitor has:
1) You need something built to generate a network effect first, other considerations second, to successfully compete.
2) You need to then leverage that network to chase Corporate money.
GitHub seems to be neglecting #1 in favor of #2 and that imbalance is an opportunity if someone can exploit it. However, that requires someone who is good at being a community builder rather than a software dev.