The Dream and Fantasy wouldn't be too large for Glacier Bay or Icy Strait, but they would be for the Lion's Gate Bridge so sailing out of Vancouver. From what I can find the Star Princess is roughly 19 feet longer and 34 feet wider than the Dream, but the Dream looks to be about 16 to 17 feet taller than the Star Princess (200 feet to 216 feet). As WDWLODGE stated, the Lion's Gate Bridge has a clearance of 200 feet (61M) at high tide. The Star Princess will fit under the bridge, but the Dream and Wish class, will not, since they are taller.
It would mean that Disney would have to sail out of Seattle with a stop at Victoria to if they were using the Dream or Fantasy.
Psy