No I do not "honestly believe the lack of DVD playback hurt the Wii" and never suggested otherwise! Your point 1) means that nearly everyone had a DVD player when the Wii launched, yet Blu Ray hasn't reached anywhere near the level DVD had by that stage. It is still a desirable feature in a games console, is all that I am saying - and it is relatively cheap to implement, considering the technology is already in the box. It's not going to make the difference between 5 or 50 million sales, but I expect it would have an effect. We're both speculating; someone needs to do a survey asking potential customers what would influence their decision in buying a new console in the next year.
I agree with point 2, but remember that the competition at the time was much more expensive, so there was a trade-off. In a year or two, the Wii U will be competing with more expensive, technologically advanced consoles, but for the first year, it is likely to be priced similarly to existing consoles, with a modest technological improvement, but may lack the multimedia features of those existing consoles. I just think that if Nintendo is to hit the ground running, it not only needs great launch games, but great launch multimedia features (unless it will be impressively competitive price-wise as a result of foregoing those features).