Even if there is no bridge, what is to stop people from using SMF or any board on the same website as a Joomla install.
I mean how many people posting on the forums need registered access to the site itself?
It affects me on several sites using Joomla where I've bridged with SMf and am using several commercial components that require logins.
My current feeling is that Joomla is no longer viable or useful for anything other than very small personal sites, in fact the whole way it's going at present leaves me stuck with either staying with 1.12 or forking out tons of cash which I don't have to convert everything over to another system. :-\