I personally think releasing the Switch now is a great move for the business.
Let's face it the first 4-5 millions new consoles released by any of the big 3 are instantly bought up by the respective company's core fanbase. And nintendo's core fanbase want to play Zelda on their new system. That's enough to completely sell out the first 3 million units even without many other titles immediately available.
If it was released on christmas, all those would be sold regardless to the same fans or scalpers. Regardless of the buzz, there would be none available to buy for anyone else. Families, parents looking to buy it for their kids, etc.
Releasing like this feeds that initial demand, and then by christmas, there will be 4-5 must-own games out for it, Not counting bombshells that they'll announce at E3 (possibly pokemon, probably more) and they're have millions more consoles ready to sell to everyone else who wants one.
