Uh I think this forums object is to wish for features.. asking for specific mods is not likely to make it happen.
It just so happens that a friend of mine has been working on a DTM mod, he mentioned to me the other day about going public with his WIP. I will have a chat to him and see if he is still interested in doing that.
I'm sure all the major series will eventually spawn for rf2 - like they did for rf1. That doesn't depend on ISI though..
is this his mod? http://www.rfactorcentral.com/detail.cfm?ID=DTM 2012 Championship for rFactor2 http://www.dtm-onlineliga.it/home/index.php?option=com_kunena&func=view&catid=88&id=1968&Itemid=385