Daydreamer

Yes of course it will, seeing as winter sports is absolutely HUGE in Norway, but it's a lot more easy to draw large crowds in Oslo and the surrounding areas since eastern Norway is home to over 50% of the population and most people wouldn't have a very long way to travel to get to the venues.

I don't think so. Not after the extremely successful Ski world championships that were held in Oslo this year, where the venues were sold out every single day, and 50.000 to 100.000 people attended the medal ceremonies in the Oslo city center every evening. I don't think Trondheim (or Tromsø, or any other city) could match that level of local enthusiasm. It was quite spectacular really.

Well, after the success with the 2011 World Ski Championships in Oslo there seems to be a lot of interest to bid for the Winter games soon, and it seems like people are most interested in having Oslo be the bidding city. It's going to be interesting to see if it's only talk or if they are actually serious. The sports federations in Norway are interested at least, according to this article from NRK. (Unfortunately only in Norwegian)