Accommodations could be made for those that don't wish -- or are unable -- to VC, however at a certain point I would argue that VC is becoming a part of playing NationStates today -- at least to some extent. More and more is taking place in VC. I'm okay with it not being weekly.
However I do not think a thread is a good idea, namely because I don't think it would drive activity and the point of PMQs is to keep the government accountable and to keep them from being able to simply use templates responses, additionally it's much easier to 'forget' to answer or to delay the answer.