It implies it and others have run with it. I addressed the thread in general, and still have.
It would be even more expensive. They are very @n@l-retentive, and every millimeter inside that body is precious. Adding seals would probably mean even tighter tolerances, some pretty innovative materials for sealing every nook and cranny. And for what? The main people who purchase these --and everybody knows it-- want them for the name, for its looks, not to take over to Antarctica or the Sahara. They are not aiming for the Indiana Jones of the Associated Press market; that market is pretty well served by Nikon and Canon, and they have a pretty good established line-up of different bodies and lenses to suit those needs.
Also, it wouldn't end there: you'd need an auto-cleaning sensor. The lenses you'd be putting in there also aren't exactly weather-rugged (as we all know, Nikon and Canon provide lenses which are rugged enough and which also minimize the blowing of air onto the sensor). The rangefinder is a fine (as in "delicate") piece which would not withstand the rigors of in-the-middle-of-the-action reporting bangs and abuses.
It just doesn't make sense to beat that dead horse to a pulp.