More light rail makes better sense, but then there's the crime factor.
Light rail is fine for heavily traveled corridors for commuting or shuttle purposes, but it's very poor in adjusting for changes in traffic flow. Cars adjust simply by turning a different direction at any intersection. Even buses have that advantage.
Light rail is quieter and provides a smoother ride than buses. It is best run on an elevated roadbed, since surface tracks in roads interfere with traffic (typically heavy along the same corridor).
Now don't get me wrong. I like light rail. I'm an old train buff myself, having once worked on a railroad. But, it has it's place and it doesn't adjust well to changes.
Government built and run light rail tends to suck. Government doesn't know how to run a railroad. One particularly horrible example is BART, in the San Francisco area. Rail ring is a real problem due to poor maintenance. The automation system it touted doesn't work that well, necessitating a 'driver' to sit in the cab and watch the robot and to override it when it fucks up. At least BART has good density of coverage.
Seattle light rail is taking forever to build out. I figure it's about a 50/50 chance the line out to the Eastside will be done before the 2nd coming of Jesus.
Some cities have done better, such as MARTA in Atlanta, GA., but crime is becoming more of a problem on it.
Vancouver BC has a system they call Skytrain, and it works quite well. Crime is not particularly a problem on it either.
None of them are profitable.