Wii Fit is still winning the poll, despite all the comments being in support of Wii Play.
Obviously the key factor here is what your sales expectations for Wii Fit is after the release of Wii Fit Plus. I don't think they've announced anything yet, but do you expect a price drop on Wii Fit after the release of Wii Fit +. I guess that's the reason Wii Fit+ and balance board bundle is $10 more than Wii Fit and the balance board, to encourage new owners to buy Wii Fit and the balance board and then later upgrade with the $20 standalone version of Wii Fit +.