metrognome: i fully appreciate and applaud the efforts by SDOT to improve access to and flow through the downtown street grid. those improvements should have been made regardless, especially the (WSDOT) king street exit/entrance from/to 99 before any central waterfront mile replacement option is pursued.
regarding freight, consider that trucks from ballard and interbay will have to traverse queen anne via mercer street to get to the north DBT portal near lake union, or continue down a waterfront that will be subject to seawall replacement construction. how does that improve mobility for freight, and how will the new mercer street handle the traffic once carried by 15th NW/elliott/western? and once freight gets that far, why wouldn't truckers avoid the 99 toll and keep going another mile to I-5?
similarly, once spokane street access to I-5 and other north-south routes are complete, i predict freight will avoid 99 like the plague.
other replacement options could allow the western/elliott exit/entrance to be maintained, and make a new 99 more useful.
i fully agree with your sentiments about "reclaiming" the waterfront, though, and i believe a large portion should be public space, and that commercial and private development should be subject to strict setback rules. we, the people, can develop property too, you know.
but leaving the viaduct in place until 2016 - especially with reduced access - is a risky gamble. and frankly, i think it's a red herring, because traffic is still going to suck while DBT is being bored - maybe worse than if the viaduct was removed. a recent study determined that surface/transit improvements without a replacement for 99 would handle traffic with modest increases in drive times.
DBT also delays seawall construction until after the viaduct is demolished and removed.
lastly, that same "stakeholders" committee found in 2006 that the DBT was the most expensive and least feasible of the 8 scenarios provided by WSDOT. the advisory committee was just that, and ultimately, the decision fell to three entities: chris gregoire, WSDOT, and greg nickels were in agreement that DBT was the way to go, and ultimately, that's how we got here.
yes, time will tell. i think the final EIS for DBT comes out in june. and it looks like we'll find out what seattleites thinks of the DBT cost and process at the ballot box.