Tri-Met and Metro want to build another light rail line, this one with an initial liar's budget of $2 billion. They want to run it from Portland State University in downtown Portland out to the Bridgeport shopping center in suburban Tualatin. Let's see how that worked out in the past:
They built the "Green Line" over on the east side, which terminates at the Clackamas shopping center. Result: no effect on traffic; people still drive to and from the shopping center as they always have.
"Red Line" terminates at Portland International Airport, with a stop at Cascade Station - home to Ikea, Best Buy, and assorted other shopping-oriented businesses. Result: no effect on traffic at that shopping center either; over 98% of trips to the Cascade Station center are made by auto. But at least that line terminates at PDX, which affords air travelers a relatively inexpensive - if highly subsidized - means of travel to and from the airport.
So in terms of transit, running light rail to stations at shopping centers doesn't seem to work very well. Light rail stops just a block from the Lloyd Center shopping mall, yet that had no significant impact on traffic; people still drive to and from there for the most part. In suburban Gresham, where the first line from downtown Portland terminates, they built a shopping mall that they call Gresham Station. No impact on traffic there, either; almost everyone drives to and from the shopping center.
Evidently unable or unwilling to learn from past results, Tri-Met and Metro now want to spend at least $2 billion to build another light rail line from Portland to the Bridgeport Village shopping center. I've been to the village a few times, and it's high-end; lot's of BMW, Mercedes, Audi, and high-dollar SUVs around there. These people are not going to ride a two-car choo-choo to shop there.
So what, exactly, is the point? There doesn't seem to be one.