The Los Angeles public
Reddit user Nick Andert took those plans and put them on a single map, explaining: "The idea is that most of these projects are planned long-term by metro, and how quickly they are built depends on politics in the next 30 years." He has since added that 2050 is the more likely completion date for all this work.
Whatever the year, for those who support public transit over driving and everyone who hates traffic, it's a wonderful vision.
Andert gave us permission to publish his map. Click to enlarge:
Here's the gif of how the new lines would be built:
And what the current network looks like: