After reading this thread with great interest over the last week, the 64bit question seems quite emotive, perhaps because it in some way encapsulares the frustration which stems from uncertianty as to the direction Sketchup will take. A vague promise of an update sometime in 2013 does little to ease the dissonence.
Those more confident about a 32bit future seem quite defensive, moverover they also seem to be those closer to the development team, which in its own way can be taken as both reassuring and worrysome - i am sure the ambiguity is not lost on most. I get the distinct impression that for some this is a dicussion we are not meant to having.
Unlike some, I would place compatability and robustness above speed for Sketchup moving foward.
Apart from the discussion there are other indicators, the amount of advertising on here for render engines experesses the most obvious Sketchup functional shortfall, while the odd advertisement for Bonzai3d circles like a vulture awaiting either Sketchups demise or the fallout from all the uncertianty.
Perhaps a robust release of a Luxrender plugin and a plugin organizer as an interum update for both free and paid versions of Sketchup, together with a future roadmap for Sketchup would placate most, certainly me.