One can reap the benefits only if SWR operates train from airport station/ Devanahalli to Bangalore local stations as well as to bigger cities like Mysore, Tumkur, Hassan, Davanagere, Shivamogga. People from these towns use Bangalore airport for their air travel.
Even one can think of trains to important stations in neighbouring states like Tirupati, Salem, Hosur, Anantapur.