That's exactly what I think does not work.
You can't see the future. Of course a simple project want to have that, but a big project is unpredictable. You should make it flexible by having a great test infrastructure to move forward fast, but you should try to create something that doesn't exist yet. Maybe it is needed, maybe not, it's just too unpredictable to write code for something that doesn't exist in the customers head.
I didn't mean "implement features before they're requested". What I meant was that designing flexibly will allow you to iterate better, and given some experience, you will probably be able to "predict" the next feature req or 2.
