Well, in the past, as I understand it, the goals of FE and rpmforge
have been very different, making a merge not really on the table.
Notably, as stated in the rpmforge FAQ, the difference between
rpmforge and FE is
"The biggest difference is that we provide packages for a range of
distributions including older Red Hat distributions, Red Hat
Enterprise Linux and others (eg. CentOS, Aurora) and different
architectures. If you expect to use both Fedora and Red Hat your
safest bet is RPMforge. Of course you can mix both, if you like."