Umm... why would you wait a few weeks? This is the official patch from Firaxis. It is now the official game standard, and the vast, overwhelming majority of the community will be using it. Unless this group plans on running 3.17 for the remainder of the game - months if not years away - there is absolutely no reason not to patch the Demogame immediately. You're going to do it anyway, why not patch and do away with irritating dual installations?
I think a good moment for switching would be when the HOF/GotM switch, since there probably is quite a large amount of players participating in both the MTDG and the HOF/GotM.
Seconded.
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