BART in 50 Years

Recently there has been a lot of news about the next 50 years at BART. Many projects are discussed but it's interesting to note some of the big ones such as a new transbay tube. The new tube hopefully would carry commuter rail as well as BART trains. It might also be worth noting that this past year carried BART's highest ridership ever. Below is a really fascinating iteration of a regional rail plan at SF Cityscape. I really like how it goes up Geary and South on 19th Avenue towards the Daly City Station. That would be huge for riders in the Sunset and Richmond districts trying to get to downtown San Francisco. But the question is, should it be Muni or BART? Also, a line through Emeryville would be awesome too. I wouldn't mind living there if there were more transit options.