The 'dead sister' comment lost it for me. Just remember in the UK it has been deemed that land under a grade 2 is suitable to diversification, I suspect that land is in the 3's. Most new golf courses are alien to some degree since the landscape is changed.
Change in the landscape can be significantly bettered ecologically, a golf course with wild areas is much better for the majority of plants, animals, birds, insects. If left in agriculture this land could be ploughed, grow potatoes, oil seed rape, grow christmas trees. If left as grazing land, then the land could be returned very easily if needed, the only real problem with golf land returning to agriculture is if it needs to be ploughed.
The pictures I have seen in my opinion show The Castle Course as stunning and I would certainly like to see it, its a wonderfull site with views over the town, the cliffs, that coupled with good design, modern methods of drainage, construction, soil improvement lead me to think the land id very fit for purpose, most architects would relish the chance of a go at this one and probably drop their fees.
I think DMK has done a great job with the 'look'.
St Andrews is the mecca, lets be honest this is the 11th course really Kingsbarns and the other two new ones (Torrance/Devlin) plus the Dukes. I am pretty sure they will all be reasonable financial winners. £4M is not that much to spend if £120 is the green fee... £30 green fee per £1M golf construction is not far off in the UK.
The proof will be in the pudding but I suspect most visitors looking for 3 rounds in the area will go TOC, Kingsbarns, Castle.