I think Juneau should remain the capital. No matter where you move it, it will still be the most inaccessible capital in the country, just perhaps a little less so.
I just see this as a power grab by Anchorage with some very political undertones.
There is debate to connect Juneau to the road system, but the road would cost hundreds of billions of dollars, pass something like 30 avalanche chutes, and require a LOT of tunneling and bridges.
This all in an age when high speed ferries are coming on line.
There has been no serious talk about building a road, I really don't expect that to happen within my lifetime.