Alaska Dispatch by Patti Epler.  ... That immediately set folks to asking: What's Plan B? The state has been trying for more than 30 years to market the abundant natural gas on the North Slope. If this gas line plan falls through, what next?   …    Now, proponents of other gas projects are smelling blood in the political waters and they're circling Juneau armed with power points and proposals. Legislators' angst over the TransCanada project, the closing of the Nikiski gas export plant and the notion of importing gas to a state [...]