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do we just push problems elsewhere?Not necessarily. I'd love to live closer to the Bay; if I could get in walking or biking range of CalTrain I could eliminate much or all of my 40 minute highway commute — thus reducing the congestion on the highway. But it would cost me ~$12k/yr. Similarly, if San Mateo had built adequate housing, 70k people might have shorter commutes, requiring less use of roads, transit systems, etc.
Personally, I am also massively for improvements to the various transit systems. If it were easily possible, I'd love to have CalTrain have grade-separation, level-boarding, electric locomotives, and ideally 4 tracks the whole way instead of the 2 they have, to promote passing and ease recovery during issues. We might get the EMUs someday, but I won't be around to see it. The downtown SF transit center finally reopened, I think, but it was a 8? month setback, not to mention it is way over budget. Also, the HOV lanes would be a lot more enticing if there weren't so much traffic in them, and there easily could have been had CA not hadn't out so many HOV stickers. There are SUVs getting stickered that get equivalent gas mileage to my '97. Also, enforcement.