In my experience Agile doesn't work in big blue chips. For sure you can develop a fairly basic wizzy new front end, but the minute you try and make it speak to clunky old backend mainframe systems, the venerable and cynical old lags with zero in the way of social skills or dress sense who maintain those ancient systems want nothing to do with the cards and the cuddly toys and the cowboy code and will, probably.correctly, not play ball and end up sabotaging the endeavour.
Good plan! Let's let the saboteurs win, who needs progress anyway?