Take a look at Metro's Staff recommendation on the proposal to truncate the Eastern end of Line 704 at Alvarado instead of Union Station.
Inside the document, scroll down to "Attachment A", and look at the Line 2/Line 704 proposal.
It says "Remove from the Program". I am hoping this means that the proposal for eastern truncation of Line 704 at Alvarado instead of Union Station has been shelved after public comment.
I recommended that Metro study rerouting Line 704 to go into the heart of downtown as the old Limited 304 bus used to do, perhaps even ending up at LA Live. When I used to work downtown in the 1990s, I would ride the old Limited 304 from downtown after work and it was always standing room only.
It's a shame that Union Station doesn't have "destination" ridership the way that Grand Central Station and Penn Station in New York, or Victoria Station, Charing Cross Station or Liverpool Street Station in New York. However, this is good news for riders on this corridor.