They would be selling to the same customer base who have likely already purchased the games for last gen.
It would not be the easiest porting process in the world, though it would be presumably easier than say the will or wii U. Porting will cost money.
Can they make enough in sales to justify this versus assigning the manpower to new IP that will have a better ROI? It is not always about cost of porting versus return, opportunity cost is always considered in the corporate world.







