I love the Wii. I would believe adding DVD and MP3 access would not take away from gaming. Look at Opera Internet Channel. Developed by a non-gaming developer.
I would love Adobe Flash Player 9 to be added so I could watch my favorite shows on abc.com, nbc.com, and cbs.com. A Wiimote for control is too cool and convenient. Not all of us want 5 remote controls or a single lame universal remote for 5 components. I could stick with 2, if the Wii played Adobe Flash 9, CDs, DVDs, and MP3 (my other remote would be for the TV).
Remember, just look at Opera. Any developer could create the software to do these things on Wii without putting their efforts into a lame game like Laser Hockey.
A cheap DVD player is $30. Anyone in the market for a cheap DVD player would gladly pay $15 for a Wii DVD Player Channel.