Juneau is a bad place to have a capital. Its like having Eureka as the capital of California or Plattsburgh as the capital of New York, as remote and distant from everyone as possible. Yes Juneau would suffer, but the rest of the state shouldn't be cut off from their own government.
Well it would be like having the capital of New York in Plattsburg, accept all road links are severed with the outside world, and a ring of 15,000 foot high mountains is placed all around the city.
Right, I forgot about that. All the more reason to move the capital.
It would be like having Honolulu become the new Washington D.C.