New Metro lines won't give the ROI people expect.

Two years ago I'd have laughed at these prices, but now I'm seriously looking for a 2BHK in Bangalore. I'm based in Dubai, so can't do site inspections easily. My main confusion is about Namma Metro Phase 2/3 expansion. Builders like Prestige and Sobha talk about it boosting values in Yelahanka and Sarjapur Road. But is it too late for *affordable* properties near these upcoming corridors? Matlab, abhi invest karna sahi hai ya prices already jump kar chuke hain? Any ground reality checks on this?