are there plans to marry both packages in some way ?

When debugging boot process I found out, that even the openBGP package try to start "default" bgpd … but this is the daemon from Quagga which gets first matched in path:

vty_read_config: failed to open configuration file /usr/pbi/quagga-amd64/etc/quagga/bgpd.conf: No such file or directory
can't open configuration file [/usr/pbi/quagga-amd64/etc/quagga/bgpd.conf]
vty_read_config: failed to open configuration file /usr/pbi/quagga-amd64/etc/quagga/bgpd.conf: No such file or directory
can't open configuration file [/usr/pbi/quagga-amd64/etc/quagga/bgpd.conf]
vty_read_config: failed to open configuration file /usr/pbi/quagga-amd64/etc/quagga/bgpd.conf: No such file or directory
can't open configuration file [/usr/pbi/quagga-amd64/etc/quagga/bgpd.conf]

it would nice to have both daemons in one so less memory is needed and the routing should be also much faster when only one daemon is used.

Simple thinking for 1st setup:
If quagga recognize OpenBGP it can make an symlink from /usr/pbi/quagga-amd64/etc/quagga/bgpd.conf to /var/etc/openbgpd/bgpd.conf or copy this content to own config file with additional needed parameters like quagga daemon password…
So the quagga deaemon can use OpenBGP package interface for configure BGP ;)

Bests

Reiner