An already running rail line certainly makes the development more plausible.  The main thing I doubt exists with this plan is a way to make the cost of the housing match what the people actually earn.  Certainly there will be plenty of cute urban style attached townhouses 2 or 3 stories high with 3-4 bedrooms.  The price of said townhouses in today's RE market would probably be around $1M.

Taking up the same space with the same external architecture would be 2-3 story condos with a 1 or 2 bedroom apt on each floor for singles and couples with no children.  These units probably sell for $300-400K.  Rent on them probably $2-3K/mo.  With similar architecture to Greenwich Village in NYC, the corner lots might have 4-6 story buildings with 4-6 studio or 1 BR units renting at $1500-2000/mo on each floor.

Note with this scheme and street/building architecture there is ZERO parking on the street, and putting in a 1 car garage takes up nearly +the whole ground floor.  So, what's the scheme for getting these folks to the light rail station?  A self-driving EV fleet of Ubers?

Finally, where in the planned Utopia is the housing for the 50% of the population who can afford a max of $1000/mo rent, and often less than that?

RE