From the article
Edinburgh Pentlands MSP Gordon MacDonald said the community would fight the plans, saying the nearby Calder Road was already “like a car park”. He said: “The proposals are going to create in the region of 3000 cars. There’s no way the public transport system can cope with any more people. In the south-west of the city, there just isn’t the infrastructure for more housing.”
I suppose they could try running more than one train an hour from Curriehill - or increase the number of carriages from two to four. All it would need is a slight adjustment to the timetable. They could also extend the routes of the many and frequent buses to Riccarton by an extra quarter-of-a-mile. Of course, the real problem's not the public transport but the fact that most homes would probably end up with two cars that all need to fit on the road somewhere.
Also:
“People are concerned that the doctors’ surgery is almost full, and getting an appointment is practically impossible. The schools are near bursting point now, especially the high school.”
Apart from the completely empty school, of course, which is lying un-used.