I suppose the problem with a master thread is that as everyone wants so many different games the discussion would get very confusing due to the fact they'll be two or three sub discussions going on but then on the other hand as you said, we don't want the forum clogged up with speculation topics... Would I be asking too much to create a subforum for this?
But that doesn't mean they won't do it. The example you chose, maybe not, but if Lego did a Dalek Ship, they could throw in Doctors 9 and Ten because they both faced them off in their era's respectively.
Personally, I would go for the Kwik E Mart, I think it combines both accuracy and playability into one excellent set, and in terms of MOCing its excellent. It provides a wide range of parts that can be used in various MOC's.