Wii =/= Wii U.
Either most people don't know about the Wii U or they think it's a ~$100 controller add-on to the Wii. The only people who are going to buy it day 1 are scalpers and fanboys.
But how does the current pre-order success compare to the original Wii, which is the best selling home console in Nintendo’s history? Wii U Daily spoke to half a dozen game retailers across California, some independent establishments and some which were part of larger chains. Every single one of them reported that the Wii U currently has more pre-orders than the original Wii back in 2006.
One retailer in Los Angeles told us that Wii U pre-orders are about 3:1 compared to the Wii, while others are seeing anywhere from 50 to 100 percent increase in pre-orders for the new console compared to the old. This isn’t that big of a surprise, actually, since the Wii was a new phenomenon back in 2006. Today, “Wii” is an established brand, and its easy to see the Wii U attract more pre-orders than the original console. Even if it’s highly unlikely that the Wii U will surpass the Wii in terms of total sales.
When the Wii launched back in 2006, it was sold out for many months to come. If the Wii U is already getting more pre-orders, we’re likely to see shortages and sell outs once it hits the stores. Analyst Michael Pachter recently said that he too believes the Wii U will sell out until next year, despite Nintendo manufacturing “1 million Wii U consoles per month”.