The "Smart Growth" concept is never good. Our biggest problem is the Growth Management Act and the policies associated with the legislation.
For the past 20-30 years there hasn't been enough lane construction to keep up with the need. The lanes that have been constructed were not designed to be user friendly. The WSDOT and WSTC, especially the WSTC, wanted it that way so they could extract more cash from us serfs for failed public transportation fiefdoms.
I'm not a fan of the second Narrows Bridge, it's in the wrong place. The bridge should have been built from Olalla to Vashon to West Seattle. I sat on my hands during Sen. Oke's re-election because of his influence over this bad project.
I don't think we'll see the Pennisula become a yuppie hellhole, where the hell would they work? The GMA will not allow industry in the rural areas.
You could build an 8 lane floating bridge that extended I-90 across Puget Sound, up Bainbridge Island, across Hood Canal and all the way to Port Angeles. The only thing you would do is to develop every square meter of land and make it look like Manhattan or the SF bay area. Traffic would be horrendous, and we would want another floating bridge to connect Kingston with North Seattle, and on and on and on.
Eventually, the Puget Sound would look like NYC. Is that what we want?
The problem is not too few roads. It's too many people.