Prof420 and Ragabash have stated that they dont want to have forums for other games at the site.
My personal opinion is that 4-5 forums for non Paradox games would boost activity as well as deal with the problem that we cant add forums here due to the gold affilate issue (which in the short and medium term wouldnt be a problem at the Paraodox site).
If there is no non paradox forums at the (likely) Paradox site there are two key questions that need to be answered:
1) will EU and HoI be enough to start the site with - If a comunity the size of the TW part of this site emerges the answer would be yes but can we build a big enough modding comunity within a reasonable length of time?
2) Were will Non TW or Paradox gaming forums go - Lusted has made clear that TWC will lose its affliate status if forums are added here, whilst people are worried about diluting a Paradox site's aim if they are added there - is not puting them at either site a sensible option?