The 3DS systems are not manufactured in Japan, they are made in China. So I don't think this would have any effect on distribution of the system (except maybe in Japan).
Good for Nintendo, a lot of aid has been promised so far for relief. Over 80 countries have pledged help, and a lot of companies are also donating. Zynga is letting people donate money by buying special items in their Facebook games, Apple is letting people donate to Red Cross Japan through iTunes, etc.