I read your link, and I respectfully disagree with its conclusions.
I think the comparison with bitkeeper misses the point. BitKeeper was a proprietary tool. Git is FOSS, and migrating to and from another Git host would be trivial compared to a bitkeeper migration to anywhere else. At least for me, that distinction matters.
IMO if you really want to ease collaboration, you need to be where the "casual contributors" are. Right now, most are at Github.
BTW, I actually looked at Gitorious. I pay Github $5/month for hosting private projects without any collaborators [*]. Gitorious doesn't seem to offer anything like that for individual users.
[*] stuff like my own private LaTeX/text files, or my "etc" files.
I think most people nowadays do not have an email account with direct IMAP/SMTP, or that would not mangle the text. It was not like that 15 years ago, but AFAICT it is the reality in 2013.
I myself don't have a personal email that works for patches (using GMail with the 2-factor authentication). Finding a way to use git-send-email to submit patches to OpenWrt was a PITA. (I reckon my life would be a lot easier if they were hosting their project on Gitorious.)