I think this is an interesting experiment. Two months ago the toll on the Bay Bridge was raised from $4 to $6 during the morning commute. And there are more toll lanes planned around the region as indicated in the article.
I start from a position of thinking this is a good idea even if folks with stickers like our family find the carpool lanes more crowded.
I am interested in hearing from readers who make the I-680 trip or the Bay Bridge morning trip about their experiences.