I haven't played the Wii for almost a year now, but then again I've never liked it....my sister however, who is the owner of the wii, well she hasn't played the Wii since she got her self a PS3 slim, in fact her wii's been unplugged from the power and her tv since she got the PS3.
I also noticed that her playing patterns have changed, she's a work-a-holic in general, but since she got the PS3 she's been making more time for gaming than she ever has for the wii, not only that but she seems to have gotten into the whole trophy thing as well, the one game she loves is Little Big Planet, loves the online.
Well that's should answer the OP question so take this as you will.