More housing and related facilities and infrastructure are definatly needed.
In the case of a new town, then building a new station or even a new railway line can be justified.
There are 37 stations to the west of 0.4 degrees west, and to the south of 52.5 degrees north which have under 5 entrances and 5 exits per day in the latest statistics. Yes, there's quite a number of them on a couple of very poorly served lines and a long way from major employment, but there are other which are rural, with quite a few trains passing through, and within commuter distance of Exeter, Plymouth, Bristol, Trowbridge and even Oxford. I suspect a few are in the land of the NIMBY, and others would benefit from an improved service only to abstract it from another railhead nearby.
Copplestone isn't the only example of a station that's grown dramatically with the station (but perhaps poorly served) there before so much housing - Severn Beach has risen from 22k to 228k in 10 years and I suspect that's partly due to service and partly due to the new housing. Based on what I've seen, it's certainly not crowds of holidaymakers and day trippers going to the beach!
No objection from me to new line or new station suggestions - but we're got a number of places where the line, station and service is there, as is the commute destination. "Just add housing"?