Honestly, no. But it will help a lot. The amount of new rail infrastructure for a contemporary US city is impressive, but only by our current standards. Almost all of New York's subway was built in a 40 year stretch, and dedicating that much of an investment in public transit (be it LRT, subway, BRT, streetcars, or buses) to really turn things over.
LA is mostly built on a grid, so that makes it easy to just run rapid transit up and down it with frequent (2-5min peak) service. It's going to need to have a good network of buses to feed into the rail projects and the rail projects actually need to go where people need/want to go (the way the Gold Line just misses CalTech is so dumb, but the US is littered with examples even more egregious). BRT will need to be done on high density roads where rail won't work. A rail network at least like this below would be necessary to get Central-West-South Central LA and the innermost parts of the SF and SG Valley to be truly transit-friendly.
