With the AI being improved so it isn't abuse-able anymore, and with new harder gods being put into circulation (Obliterator, for instance), I think that each week there should be different gods available.
Zanz would choose five to six false gods every week randomly (or maybe he could have themed weeks...) and we would have to live with playing only those five to six. If they were really hard ones, sucks for us. Then again they could be easy ones. If he did it randomly, I bet Zanz could even simply make a method to randomly choose five to six gods every week.
As it is, since there are *24* gods that are in circulation or will be in circulation, that's a LOT of decks you need to be able to counter. In fact, I would say it is darn near impossible to build a deck that can beat all 24 gods. Especially with the improved AI, and the new gods are actually pretty hard.
In addition, this would force you to make a new counter deck every week. Maybe one week you'll take out the firefly queen in your deck since it isn't needed, maybe another week you'll want to have three of them in your deck.
Basically, it would make farming gods easier (still probably not as easy as they used to be), and force you to adapt your deck. This means you wouldn't just be able to go on to the forum and find a deck and stick with it; you need to be smart enough to change it up yourself depending on the available gods.