I do not quite believe Wii Sports Resort will beat Wii Fit.
Wii Fit should be over 25 million by the end of the year, and has a chance of selling up to 10 million more after that, unless Wii Fit Plus kills it off. And however much I believe in Wii Sports Resort, 35 million sounds a bit too much.
Wii Sports Resort should sell at least 2 million in Japan, probably more like 3-4 million. And it will do at least 4 million in the US, as well as in Others. So 10 million is almost guaranteed, and 15 million lifetime is probably a bit too low as well.
My guess is it will end up somewhere around 20 million lifetime.